Skip to main content
Download PDF

Sleep disturbances and the speed of multimorbidity development in old age: results from a longitudinal population-based study

BMC Medicine volume 18, Article number: 382 (2020) Cite this article

Abstract

Background

Sleep disturbances are prevalent among older adults and are associated with various individual diseases. The aim of this study was to investigate whether sleep disturbances are associated with the speed of multimorbidity development among older adults.

Methods

Data were gathered from the Swedish National study of Aging and Care in Kungsholmen (SNAC-K), an ongoing population-based study of subjects aged 60+ (N = 3363). The study included a subsample (n = 1189) without multimorbidity at baseline (< 2 chronic diseases). Baseline sleep disturbances were derived from the Comprehensive Psychiatric Rating Scale and categorized as none, mild, and moderate–severe. The number of chronic conditions throughout the 9-year follow-up was obtained from clinical examinations. Linear mixed models were used to study the association between sleep disturbances and the speed of chronic disease accumulation, adjusting for sex, age, education, physical activity, smoking, alcohol consumption, depression, pain, and psychotropic drug use. We repeated the analyses including only cardiovascular, neuropsychiatric, or musculoskeletal diseases as the outcome.

Results

Moderate–severe sleep disturbances were associated with a higher speed of chronic disease accumulation (ß/year = 0.142, p = 0.008), regardless of potential confounders. Significant positive associations were also found between moderate–severe sleep disturbances and neuropsychiatric (ß/year = 0.041, p = 0.016) and musculoskeletal (ß/year = 0.038, p = 0.025) disease accumulation, but not with cardiovascular diseases. Results remained stable when participants with baseline dementia, cognitive impairment, or depression were excluded.

Conclusion

The finding that sleep disturbances are associated with faster chronic disease accumulation points towards the importance of early detection and treatment of sleep disturbances as a possible strategy to reduce chronic multimorbidity among older adults.

Peer Review reports

Background

Sleep disturbances are a “public health problem,” as a third of adults report having insufficient sleep [1, 2], and half of older adults report some type of sleep disturbance [3]. While the prevalence of diagnosed insomnia disorder ranges from 5 to 8%, 20–40% report insomnia, and up to 50% complain of sleep problems [4, 5]. It has been estimated that the mean total healthcare costs were 75% higher for groups with moderate and severe insomnia compared to those with no insomnia, of a health plan sample in the USA [6]. Similarly, those with untreated insomnia have higher all-cause healthcare utilization [7], providing evidence for the economic burdens of (undiagnosed/untreated) sleep disturbances.

Chronic sleep disturbances have a range of negative health consequences, including hypertension, cardiovascular diseases, stroke, obesity, diabetes, migraines, and mortality [8, 9]. Sleep disturbances are also associated with an increased risk for dementia [10, 11], cognitive impairment [12,13,14], and depressive symptoms [15, 16]. Another important consequence of sleep disturbances is daytime sleepiness/drowsiness, which is associated with falls, death, and accidents [17, 18]. In a National Sleep Foundation survey, the frequency of sleep problem reports among older adults was 53% among those with no medical condition and escalated up to 80% among those with 4+ medical conditions, demonstrating the need for further investigations [18, 19]. Similarly, insomnia was associated with multiple medical and psychiatric comorbidities in a large analysis of Medicare beneficiaries (USA) [7].

To understand the broad implications of chronic sleep disturbances, it is important to simultaneously investigate the associations between sleep disturbances and multiple health outcomes. Multimorbidity refers to the coexistence of two or more chronic medical conditions in an individual [20]. Although multimorbidity is the norm among older adults [21, 22], there are inter-individual differences in the speed of multimorbidity development and progression.

Cross-sectional studies showed that short sleep duration, feelings of drowsiness, and difficulties sleeping were associated with multimorbidity [23, 24]. In a multi-national cross-sectional study, a linear dose-dependent association was found between the number of chronic conditions and sleep disturbances [25]. Findings from a US middle-aged sample showed that among several health-promoting behaviors, only sleep and physical activity were associated with multimorbidity [26]. Sex differences have also been demonstrated, including differences in the relationship between sleep disturbances and commonly co-occurring chronic conditions [27]. The association between sleep disturbances and multimorbidity may be bidirectional. For example, one study showed that the number of physical conditions at baseline was associated with incident insomnia two years later [28].

The aim of this study was to investigate the association between sleep disturbances and the speed of multimorbidity development, a proxy for loss of resilience and multisystem homeostatic dysregulation in older adults [29, 30].

Methods

Study design and population

The study population was derived from the Swedish National study of Aging and Care in Kungsholmen (SNAC-K), an ongoing population-based study, which enrolled adults aged 60 years and older living in the community or in institutions in the Kungsholmen district of Stockholm between 2001 and 2004 [31]. A total of 4590 people from 11 age cohorts (60, 66, 72, 78, 81, 84, 87, 90, 93, 96, and ≥ 99 years) were randomly invited to participate in the study. Finally, 3363 accepted to participate in the baseline examination (73.3% participation rate). Follow-up assessments are performed every six years for younger participants (60–78 years) and every three years for older participants (≥ 78 years). In the current study, we included a subsample of 1189 participants without multimorbidity at baseline (i.e., < 2 chronic disease) and with data for the main exposure.

SNAC-K participants undergo a comprehensive clinical and functional assessment by trained personnel at baseline and follow-ups. Data on past medical history and vital status were also available through the National Patient Register and the Swedish Death Register.

Ethics, consent, and permissions

SNAC-K was approved by the Regional Ethical Review Board in Stockholm in Sweden. Written informed consent was collected from all participants or, if the participant was not capable of providing such consent, it was obtained from a proxy.

Multimorbidity assessment

The total number of chronic conditions at baseline and at the follow-ups was operationalized according to the comprehensive list proposed by Calderon-Larrañaga et al., described elsewhere [32]. All the diagnoses were coded according to the International Classification of Diseases, 10th revision (ICD-10) and then classified as chronic or not chronic; then, those classified as chronic were grouped into 60 broader disease categories. Clinical information, laboratory test results, current treatment, and data from primary care and hospital medical records were also used to identify specific chronic conditions. Chronic conditions considered cardiovascular risk factors (i.e., hypertension, dyslipidemia, and obesity) were excluded from the total count consistent with previous studies [33]. Sleep disorders (ICD-10 codes F510-13 and G47) were also excluded to avoid exposure–outcome circularity.

Sleep disturbances

The presence of sleep disturbances at baseline was assessed by physicians through the Comprehensive Psychiatric Rating Scale (CPRS), a scale rating the severity of psychiatric symptoms and observed behavior and change in symptoms over time [34]. The degree of sleep disturbances was categorized into three groups according to participants’ answers to the CPRS items on sleep: no sleep disturbances, mild sleep disturbances (grouping the categories 1–2 “Slight difficulty dropping off to sleep or slightly reduced, light or fitful sleep”), and moderate–severe sleep disturbances (grouping the categories 3–4 “Sleep reduced or broken by at least two hours” and 5–6 “Less than two or three hours of sleep”).

Covariates

Education was measured as the highest level of formal education and was categorized as elementary school, high school, and university or above. Physical activity was categorized into three groups of intensity: inadequate, health-enhancing, and fitness-enhancing [35]. Smoking habit was categorized as never, former, or current smoker, and alcohol consumption as never, light/moderate, and heavy consumption. Body mass index (BMI) was calculated by dividing weight in kilograms by the square of height in meters and then categorized as underweight (< 18.5 kg/m2), normal weight (18.5–24.9 kg/m2, reference category), overweight (25–29.9 kg/m2), or obese (≥ 30 kg/m2). We created a variable identifying people taking psychotropic drugs (i.e., anxiolytics, hypnotics, sedatives, antipsychotics, and antidepressants). The self-reported presence of any pain in the last month before baseline was also considered. Depressive symptoms were assessed through the Montgomery–Åsberg Depression Scale (MADRS) [36], a 10-item subscale driven from the CPRS rating depressive symptom intensity, frequency, and duration. The MADRS scores range between 0 and 60, and scores > 9 reflect the presence of depression [37].

Statistical analyses

The cross-sectionaly associations between baseline sociodemographic, clinical and lifestyle characteristics and sleep disturbances were examined using the chi-square test for proportions and the Kruskal–Wallis test for continuous variables.

The longitudinal associations between sleep disturbances at baseline and the speed of chronic disease accumulation throughout the 9-year follow-up were analyzed through linear mixed models. We included the interaction term between time and the main exposure as a fixed effect. The β coefficients for such interactions can be interpreted as the effect of each level of sleep disturbance on the average annual increase in the number of chronic diseases [29, 30]. Random effects were defined for the intercept and slope, unstructured covariance was assumed, and restricted maximum likelihood estimation was applied. Models were adjusted for all covariates in a cumulative manner: (1) sex, age, and education; (2) additionally by physical activity, smoking, and alcohol consumption; and (3) additionally by the presence of depression (MADRS score > 9), presence of any pain, use of psychotropic medication, and presence of one chronic disease at baseline. Three-way interactions between age, sex, or psychotropic drug use and sleep disturbances × time were tested. To investigate the role of sleep disturbances on the development of specific clusters of chronic diseases [38], we repeated the analyses including only cardiovascular, neuropsychiatric, and musculoskeletal diseases as the outcome in three different models. Last, we explored if specific types of sleep disturbances were associated with multimorbidity development, either among participants reporting any type of sleep disturbances or in the whole study sample.

Sensitivity analyses

To evaluate if the associations were driven by any specific chronic conditions either at baseline or at follow-ups, we first compared the distribution of the most prevalent cardiovascular, neuropsychiatric, and musculoskeletal chronic diseases by the presence and severity of sleep disturbances at baseline using the chi-square test. Second, we repeated the analyses concerning cardiovascular, neuropsychiatric, and musculoskeletal diseases after removing the three most common chronic conditions from each group of diseases, one at a time. Third, we repeated the analyses excluding those participants with a diagnosis of dementia or a Mini-Mental State Examination (MMSE) score < 24 at baseline (n = 13), to avoid exposure measurement error in these participants. We also repeated the analyses excluding participants with a diagnosis of depression or a MADRS score > 9 at baseline (n = 43). All analyses were performed using Stata v.14.

Results

The mean age of participants was 67.5 years (SD = 7.9) and 58% were female (Supplementary Table 1). Those with missing exposure data (n = 28) were more likely to be widow and have an elementary education compared with the study population. Participants with moderate–severe sleep disturbances were more likely to take psychotropic drugs, suffer from depressive symptoms, and self-report pain compared to those with no or mild disturbances (Table 1). There was also a higher proportion of women among participants with moderate–severe disturbances, and this group had higher levels of inadequate physical activity (Table 1). Among the population with sleep disturbances, the three most prevalent types of disturbances were waking up during the night (86.5%), waking up early (51.6%), and problems to fall asleep (39.1%) (Table 2).

Table 1 Baseline distribution of sociodemographic, clinical, and lifestyle characteristics by presence and severity of sleep disturbances
Full size table
Table 2 Type of disturbances among subjects reporting sleep disturbances in the study sample
Full size table

Moderate–severe sleep disturbances at baseline were associated with a higher speed of chronic disease accumulation throughout the 9-year follow-up, and the direction and magnitude of the association remained stable regardless of potential confounders (Table 3). No significant interactions were found with age, sex, or psychotropic drug use. When focusing on specific groups of chronic diseases, a significant positive association was found between moderate–severe sleep disturbances and neuropsychiatric and musculoskeletal disease accumulation, but not with cardiovascular diseases (Table 4, Fig. 1).

Table 3 Association between sleep disturbances at baseline and rate of chronic diseases accumulation throughout the 9-year follow-up
Full size table
Table 4 Association between sleep disturbances at baseline and rate of cardiovascular (CV), neuropsychiatric (NP), and musculoskeletal (MSK) chronic disease accumulation throughout the 9-year follow-up
Full size table
Fig. 1
figure1

Predicted number of neuropsychiatric (NP) and musculoskeletal (MSK) chronic diseases over the 9-year follow-up in relation to the presence and severity of sleep disturbances at baseline

ß coefficients for the interaction term between time and the exposure, obtained through linear mixed models. Models adjusted by sex, age, education level, physical activity, smoking, alcohol consumption, BMI, presence of depression (MADRS score > 9) except for the model with NP diseases as the outcome, presence of pain, psychotropic medication, and presence of any chronic disease. Neuropsychiatric diseases: depression and mood diseases, dementia, neurotic or stress-related and somatoform diseases, migraine and facial pain syndromes, peripheral neuropathy, Parkinson or parkinsonism, epilepsy, schizophrenia and delusional diseases, multiple sclerosis, other psychiatric or behavioral diseases, and other neurological diseases. Musculoskeletal diseases: dorsopathies, inflammatory arthropathies, osteoarthritis and other degenerative joint diseases, osteoporosis, and other musculoskeletal and joint diseases.

Full size image

When focusing on specific types of sleep disturbances, “feeling tired more than 2 hours during the day” was consistently associated with the rate of total, neuropsychiatric, and musculoskeletal disease accumulation (Supplementary Tables 2A and B).

Except for ischemic heart disease and depression and mood diseases (borderline statistical significance), no other differences were found in the baseline distribution of the most prevalent cardiovascular, neuropsychiatric, and musculoskeletal chronic diseases by presence and severity of sleep disturbances (Supplementary Table 3). When the analyses in Table 4 were repeated after removing one condition at a time (only the individual condition specified) from each group of chronic diseases (Supplementary Table 4), similar findings were obtained. The one exception was musculoskeletal disease; when osteoarthritis and other degenerative joint diseases were removed, the association was no longer significant. Results remained the same when participants with a baseline diagnosis of dementia or MMSE < 24 were excluded from the study sample (Supplementary Table 5). When participants with depression and mood diseases or a MADRS score > 9 were excluded, the direction of the association between moderate–severe sleep disturbances and the rate of chronic disease accumulation remained the same, even if it did not reach statistical significance (Supplementary Table 6).

Discussion

This study sought to investigate the association between sleep disturbances and the speed of multimorbidity development in older adults. Results showed that moderate–severe sleep disturbances at baseline were independently associated with a higher speed of chronic disease accumulation during the 9-year follow-up. With regard to specific groups of chronic diseases, a significant positive association was found between moderate–severe sleep disturbances and neuropsychiatric and musculoskeletal disease accumulation, but not with cardiovascular diseases. To the best of our knowledge, this is the first study to longitudinally investigate sleep and speed of multimorbidity development after a long follow-up duration in a large population-based study. Considering that this is the first study to show such associations, direct comparisons cannot be made with previous literature.

Our finding on the association between sleep disturbances and accumulation of neuropsychiatric diseases supports previous cross-sectional results from nationally representative samples, where of several conditions, depression was the only one consistently associated with sleep disturbances [25]. In a Korean study, baseline insomnia was associated with incident depression after two years [28]. In our study, even when depression was removed from the analyses, the associations remained robust. This may highlight the additional strong associations between sleep disturbances and dementia and migraine and facial pain syndromes. Our findings are consistent with studies showing that sleep disturbances are associated with dementia risk [10, 11]. This study additionally supports a recent meta-analysis showing that obstructive sleep apnea is associated with cerebrovascular diseases [39]. The current findings provide further evidence regarding the association between sleep disturbances and incidence of neuropsychiatric conditions, but also a faster accumulation of neuropsychiatric conditions.

Regarding our finding on the association between sleep disturbances and speed of musculoskeletal disease accumulation, when osteoarthritis and other degenerative joint diseases were removed from the analyses, the associations were no longer significant, suggesting a central role of these conditions. A recent systematic review and meta-analysis has shown that having osteoarthritis was associated with the presence of other chronic conditions and multimorbidity in a dose-dependent manner [40]. Our results add to this literature by highlighting the role of osteoarthritis and degenerative joint disease in the associations between sleep disturbances and musculoskeletal disease accumulation. These findings are also consistent with cross-sectional results from Brazil demonstrating a U-shaped association; both short sleep and long sleep duration were associated with rheumatism/arthritis/arthrosis and osteoporosis [23]. Short sleep duration was also associated with back pain problems. Similarly, in the aforementioned multi-national study, sleep disturbances were associated with arthritis [25]. Another cross-sectional study among older adults in Germany showed that insomnia and daytime tiredness were associated with joint diseases [27]. Increased pain and inflammation are proposed as central mechanisms in these associations, and fatigue may also play a role [41, 42].

In the current study, although the lack of association between sleep disturbances and cardiovascular disease accumulation may appear to contradict previous findings, comparisons are in fact non-feasible, considering the cross-sectional study designs, differences in age groups, definitions of multimorbidity, sleep disturbance measurements, and non-included potential confounders (e.g., BMI, hypnotics, education, smoking, alcohol consumption, exercise) in the previous studies reporting positive associations [9, 23, 25, 27]. These methodological differences may contribute to the observed differences. Moreover, in our study, the non-significant association between sleep disturbances and cardiovascular disease may reflect a selection bias; in this sample of older adults, those with cardiovascular diseases may have not participated in this study or its follow-up assessments due to earlier adverse outcomes (e.g., mortality and disability). Also, participants with cardiovascular diseases tend to have other coexisting chronic conditions [43] and may have been excluded from our study sample, which may have prevented us from finding such an association.

The results showed that there were no significant interactions between sleep disturbances and age or sex. A previous study did find sex-specific associations; insomnia and specific insomnia symptoms were associated with multimorbidity among women, but not among men [27]. This study differed from the current one as it was cross-sectional and it did not adjust for depression, chronic diseases, and pain. Also, the sample was slightly older in age with lower education levels. Considering the previously reported sex differences in sleep, this topic warrants further investigation among older adults [44].

Several mechanisms may underlie the associations observed. First, an important mechanism underlying neuropsychiatric and cardiovascular conditions is dysregulations in the hypothalamic–pituitary–adrenal (HPA) axis [45, 46], which are also implicated in sleep disturbances. Poor sleep quality enhances the reactivity of the HPA axis and is associated with higher daytime cortisol levels [47, 48], and altered cortisol awakening response [49]. The relationship between sleep disturbances and HPA axis dysregulations may be bidirectional, as HPA axis hyperactivation is also associated with poor sleep [50]. Second, sleep disturbances are connected with dysregulations in inflammatory markers. For example, sleep disturbances are associated with higher levels of C-reactive protein (CRP) and interleukin-6 (IL-6) [51], which are also commonly elevated in musculoskeletal and neuropsychiatric diseases [52, 53], and among people with a fast accumulation of chronic diseases [54]. These mechanisms may also impact serotonin, a neurotransmitter that plays a role in regulating sleep-wake states, and also regulates mood and tends to be depleted in depression, representing an important component in the pathophysiology of the disorder [55,56,57]. Another potential mechanism may be through the neuropeptide orexin, which regulates sleep-wake cycles and the circadian rhythm and plays a role in cognitive function and the cardiovascular system [58]. Orexin receptor antagonists have been investigated for their potential therapeutic effects for the treatment of insomnia [59]. Sleep disturbances are also associated with compromises in metabolic health and can increase the risk for obesity, dyslipidemia, hypertension, and impaired glucose metabolism, all of which increase the risk for cardiovascular conditions [60]. Lifestyle factors, beyond those taken into account in our models (e.g., changes in appetite, diet, and polypharmacy), which also increase cardiometabolic risk and degrade sleep quality [60,61,62].

This study has a few limitations. The measure of sleep was self-reported and measured at a single time point. Objective measures of chronic sleep disturbances may provide more reliable data. While the current study investigates sleep in late life and its association with multimorbidity, evidence from other studies highlights the importance of midlife sleep and adverse outcomes [11, 14, 63]. Regarding the feelings of tiredness during the day, we could not examine the source of tiredness, as this additional information was not collected. We also did not have clinical measures of sleep apnea, which is associated with multimorbidity [64, 65], and some parameters such as sleep efficiency and sleep latency are not included. The external validity of the study is limited because the sample only included healthy participants from SNAC-K population, which is wealthier than average in Sweden, and may have better lifestyle and fewer vascular risk factors (e.g., obesity). Attrition due to mortality and dropout might have affected the results. Although we excluded subjects with multimorbidity at baseline, and adjusted our models for several confounders, the possibility of reverse causality or residual confounding cannot be fully discarded given the potential heterogeneity in subclinical health states leading to multimorbidity. Finally, sleep disturbances may in fact represent the symptoms of already established disorders (e.g., depression, arthritis). These could be the single disorders that people with only one disease suffer from (who were not excluded from the study sample) or disorders that were undiagnosed yet at baseline. In both cases, this could potentially lead to reverse causality regarding the associations between sleep disturbances and multimorbidity.

Despite the limitations, this study has several strengths. First, this study is population-based, longitudinal, with baseline measures of sleep disturbances in old age, and a 9-year follow-up. Second, chronic conditions were either objectively measured by physicians within the SNAC-K study or retrieved in medical health records, including a wide range of diseases. Third, this study provides data on the speed of multimorbidity accumulation, a proxy for the speed of biological aging [66]. Fourth, individuals with multimorbidity at baseline were excluded from analyses, which limits the risk of reverse causality. Fifth, sleep was measured using a validated scale including several parameters of sleep disturbances. Finally, we have adjusted for potential confounders including medications.

Sleep disturbances and circadian rhythm disruptions may be a proxy of biological vulnerability or early disease stage [67] and therefore may help identify individuals with potentially worse multimorbidity trajectories. Sleep disturbances tend to be chronic, and interventions need to target a comprehensive range of behavioral/lifestyle factors that impact sleep. Evidence from randomized controlled trials offers support for cognitive behavioral therapy for insomnia (CBT-I) as an effective and comprehensive non-pharmacological approach [61, 62, 68]. Considering the potential side effects of pharmacological treatments, they are recommended as a last resort [61].

Conclusion

In conclusion, for the first time, this study showed that moderate–severe sleep disturbances were associated with a higher speed of overall, neuropsychiatric and musculoskeletal chronic disease accumulation over time.

Availability of data and materials

Data are from the SNAC-K project, a population-based study on aging and dementia (http://www.snac-k.se/). Access to these original data is available to the research community upon approval by the SNAC-K data management and maintenance committee. Applications for accessing these data can be submitted to Maria Wahlberg (Maria.Wahlberg@ki.se) at the Aging Research Center, Karolinska Institutet, Stockholm, Sweden.

References

  1. 1.

    Hafner M, Stepanek M, Taylor J, Troxel WM, van Stolk C. Why sleep matters-the economic costs of insufficient sleep: a cross-country comparative analysis. Rand Health Q. 2017;6(4):11.

    PubMed  PubMed Central  Google Scholar 

  2. 2.

    Liu Y, Wheaton AG, Chapman DP, Cunningham TJ, Lu H, Croft JB. Prevalence of healthy sleep duration among adults - United States, 2014. Mmwr-Morbid Mortal W. 2016;65(6):137–41.

    Article  Google Scholar 

  3. 3.

    Neikrug AB, Ancoli-Israel S. Sleep disorders in the older adult - a mini-review. Gerontology. 2010;56(2):181–9.

    PubMed  Article  PubMed Central  Google Scholar 

  4. 4.

    Gooneratne NS, Vitiello MV. Sleep in older adults: normative changes, sleep disorders, and treatment options. Clin Geriatr Med. 2014;30(3):591–627.

    PubMed  PubMed Central  Article  Google Scholar 

  5. 5.

    Li J, Vitiello MV, Gooneratne NS. Sleep in normal aging. Sleep Med Clin. 2018;13(1):1–11.

    PubMed  Article  PubMed Central  Google Scholar 

  6. 6.

    Sarsour K, Kalsekar A, Swindle R, Foley K, Walsh JK. The association between insomnia severity and healthcare and productivity costs in a health plan sample. Sleep. 2011;34(4):443–50.

    PubMed  PubMed Central  Article  Google Scholar 

  7. 7.

    Wickwire EM, Tom SE, Scharf SM, Vadlamani A, Bulatao IG, Albrecht JS. Untreated insomnia increases all-cause health care utilization and costs among Medicare beneficiaries. Sleep. 2019;42(4):zsz007.

  8. 8.

    Itani O, Jike M, Watanabe N, Kaneita Y. Short sleep duration and health outcomes: a systematic review, meta-analysis, and meta-regression. Sleep Med. 2017;32:246–56.

    PubMed  Article  PubMed Central  Google Scholar 

  9. 9.

    Wang YM, Song M, Wang R, Shi L, He J, Fan TT, Chen WH, Wang L, Yu LL, Gao YY, et al. Insomnia and multimorbidity in the community elderly in China. J Clin Sleep Med. 2017;13(4):591–7.

    PubMed  PubMed Central  Article  Google Scholar 

  10. 10.

    Shi L, Chen SJ, Ma MY, Bao YP, Han Y, Wang YM, Shi J, Vitiello MV, Lu L. Sleep disturbances increase the risk of dementia: a systematic review and meta-analysis. Sleep Med Rev. 2018;40:4–16.

    PubMed  Article  PubMed Central  Google Scholar 

  11. 11.

    Sindi S, Kareholt I, Johansson L, Skoog J, Sjoberg L, Wang HX, Johansson B, Fratiglioni L, Soininen H, Solomon A, et al. Sleep disturbances and dementia risk: a multicenter study. Alzheimers Dement. 2018;14(10):1235–42.

    PubMed  Article  PubMed Central  Google Scholar 

  12. 12.

    Yaffe K, Falvey CM, Hoang T. Connections between sleep and cognition in older adults. Lancet Neurol. 2014;13(10):1017–28.

    PubMed  Article  PubMed Central  Google Scholar 

  13. 13.

    Fortier-Brochu E, Beaulieu-Bonneau S, Ivers H, Morin CM. Insomnia and daytime cognitive performance: a meta-analysis. Sleep Med Rev. 2012;16(1):83–94.

    PubMed  Article  PubMed Central  Google Scholar 

  14. 14.

    Sindi S, Johansson L, Skoog J, Mattsson AD, Sjoberg L, Wang HX, Fratiglioni L, Kulmala J, Soininen H, Solomon A, et al. Sleep disturbances and later cognitive status: a multi-centre study. Sleep Med. 2018;52:26–33.

    PubMed  Article  PubMed Central  Google Scholar 

  15. 15.

    Sun Y, Shi L, Bao Y, Sun Y, Shi J, Lu L. The bidirectional relationship between sleep duration and depression in community-dwelling middle-aged and elderly individuals: evidence from a longitudinal study. Sleep Med. 2018;52:221–9.

    PubMed  Article  PubMed Central  Google Scholar 

  16. 16.

    Zhai L, Zhang H, Zhang D. Sleep duration and depression among adults: a meta-analysis of prospective studies. Depress Anxiety. 2015;32(9):664–70.

    PubMed  Article  PubMed Central  Google Scholar 

  17. 17.

    Leger D, Bayon V, Ohayon MM, Philip P, Ement P, Metlaine A, Chennaoui M, Faraut B. Insomnia and accidents: cross-sectional study (EQUINOX) on sleep-related home, work and car accidents in 5293 subjects with insomnia from 10 countries. J Sleep Res. 2014;23(2):143–52.

    PubMed  Article  PubMed Central  Google Scholar 

  18. 18.

    Miner B, Kryger MH. Sleep in the aging population. Sleep Med Clin. 2017;12(1):31–8.

    PubMed  Article  PubMed Central  Google Scholar 

  19. 19.

    NSF: National Sleep Foundation. Sleep in Americal Poll. https://www.sleepfoundation.org/sites/default/files/inline-files/2003SleepPollExecSumm.pdf Accessed 1 Sept 2019 2003.

  20. 20.

    Johnston MC, Crilly M, Black C, Prescott GJ, Mercer SW. Defining and measuring multimorbidity: a systematic review of systematic reviews. Eur J Pub Health. 2019;29(1):182–9.

    Article  Google Scholar 

  21. 21.

    Marengoni A, Angleman S, Melis R, Mangialasche F, Karp A, Garmen A, Meinow B, Fratiglioni L. Aging with multimorbidity: a systematic review of the literature. Ageing Res Rev. 2011;10(4):430–9.

    Article  Google Scholar 

  22. 22.

    Violan C, Foguet-Boreu Q, Flores-Mateo G, Salisbury C, Blom J, Freitag M, Glynn L, Muth C, Valderas JM. Prevalence, determinants and patterns of multimorbidity in primary care: a systematic review of observational studies. PLoS One. 2014;9(7):e102149.

    PubMed  PubMed Central  Article  CAS  Google Scholar 

  23. 23.

    Lima MG, Bergamo Francisco PM, de Azevedo Barros MB. Sleep duration pattern and chronic diseases in Brazilian adults (ISACAMP, 2008/09). Sleep Med. 2012;13(2):139–44.

    PubMed  Article  PubMed Central  Google Scholar 

  24. 24.

    Eckerblad J, Theander K, Ekdahl A, Unosson M, Wirehn AB, Milberg A, Krevers B, Jaarsma T. Symptom burden in community-dwelling older people with multimorbidity: a cross-sectional study. BMC Geriatr. 2015;15:1.

    PubMed  PubMed Central  Article  Google Scholar 

  25. 25.

    Koyanagi A, Garin N, Olaya B, Ayuso-Mateos JL, Chatterji S, Leonardi M, Koskinen S, Tobiasz-Adamczyk B, Haro JM. Chronic conditions and sleep problems among adults aged 50 years or over in nine countries: a multi-country study. PLoS One. 2014;9(12):e114742.

    PubMed  PubMed Central  Article  CAS  Google Scholar 

  26. 26.

    Loprinzi PD. Health-enhancing multibehavior and medical multimorbidity. Mayo Clin Proc. 2015;90(5):624–32.

    PubMed  Article  PubMed Central  Google Scholar 

  27. 27.

    Helbig AK, Stockl D, Heier M, Thorand B, Schulz H, Peters A, Ladwig KH, Meisinger C. Relationship between sleep disturbances and multimorbidity among community-dwelling men and women aged 65-93 years: results from the KORA Age Study. Sleep Med. 2017;33:151–9.

    PubMed  Article  PubMed Central  Google Scholar 

  28. 28.

    Kim JM, Stewart R, Kim SW, Yang SJ, Shin IS, Yoon JS. Insomnia, depression, and physical disorders in late life: a 2-year longitudinal community study in Koreans. Sleep. 2009;32(9):1221–8.

    PubMed  PubMed Central  Article  Google Scholar 

  29. 29.

    Dekhtyar S, Vetrano DL, Marengoni A, Wang HX, Pan KY, Fratiglioni L, Calderón-Larrañaga A. Association between speed of multimorbidity accumulation in old age and life experiences: a cohort study. Am J Epidemiol. 2019;188(9):1627–36.

  30. 30.

    Pérez LM, Hooshmand B, Mangialasche F, Mecocci P, Smith AD, Refsum H, Inzitari M, Fratiglioni L, Rizzuto D, Calderón-Larrañaga A. Glutathione serum levels and rate of multimorbidity development in older adults. J Gerontol: Series A. 2020;75(6):1089–94.

  31. 31.

    Lagergren M, Fratiglioni L, Hallberg IR, Berglund J, Elmstahl S, Hagberg B, Holst G, Rennemark M, Sjolund BM, Thorslund M, et al. A longitudinal study integrating population, care and social services data. The Swedish National study on Aging and Care (SNAC). Aging Clin Exp Res. 2004;16(2):158–68.

    PubMed  Article  PubMed Central  Google Scholar 

  32. 32.

    Calderon-Larranaga A, Vetrano DL, Onder G, Gimeno-Feliu LA, Coscollar-Santaliestra C, Carfi A, Pisciotta MS, Angleman S, Melis RJF, Santoni G, et al. Assessing and measuring chronic multimorbidity in the older population: a proposal for its operationalization. J Gerontol A Biol Sci Med Sci. 2017;72(10):1417–23.

    PubMed  Google Scholar 

  33. 33.

    Vetrano DL, Rizzuto D, Calderon-Larranaga A, Onder G, Welmer AK, Bernabei R, Marengoni A, Fratiglioni L. Trajectories of functional decline in older adults with neuropsychiatric and cardiovascular multimorbidity: a Swedish cohort study. PLoS Med. 2018;15(3):e1002503.

    PubMed  PubMed Central  Article  Google Scholar 

  34. 34.

    Asberg M, Montgomery SA, Perris C, Schalling D, Sedvall G. A comprehensive psychopathological rating scale. Acta Psychiatr Scand Suppl. 1978;271:5–27.

    Article  Google Scholar 

  35. 35.

    Rydwik E, Welmer AK, Kareholt I, Angleman S, Fratiglioni L, Wang HX. Adherence to physical exercise recommendations in people over 65--the SNAC-Kungsholmen study. Eur J Pub Health. 2013;23(5):799–804.

    Article  Google Scholar 

  36. 36.

    Montgomery SA, Asberg M. A new depression scale designed to be sensitive to change. Br J Psychiatry. 1979;134:382–9.

    CAS  PubMed  Article  Google Scholar 

  37. 37.

    Zimmerman M, Chelminski I, Posternak M. A review of studies of the Montgomery-Asberg Depression Rating Scale in controls: implications for the definition of remission in treatment studies of depression. Int Clin Psychopharmacol. 2004;19(1):1–7.

    PubMed  Article  PubMed Central  Google Scholar 

  38. 38.

    Prados-Torres A, Calderon-Larranaga A, Hancco-Saavedra J, Poblador-Plou B, van den Akker M. Multimorbidity patterns: a systematic review. J Clin Epidemiol. 2014;67(3):254–66.

    PubMed  Article  Google Scholar 

  39. 39.

    Wu Z, Chen F, Yu F, Wang Y, Guo Z. A meta-analysis of obstructive sleep apnea in patients with cerebrovascular disease. Sleep Breath. 2018;22(3):729–42.

    PubMed  Article  PubMed Central  Google Scholar 

  40. 40.

    Swain S, Sarmanova A, Coupland C, Doherty M, Zhang W. Comorbidities in osteoarthritis: a systematic review and meta-analysis of observational studies. Arthritis Care Res (Hoboken). 2020;72(7):991–1000.

    CAS  Article  Google Scholar 

  41. 41.

    Smith MT, Quartana PJ, Okonkwo RM, Nasir A. Mechanisms by which sleep disturbance contributes to osteoarthritis pain: a conceptual model. Curr Pain Headache Rep. 2009;13(6):447–54.

    PubMed  Article  PubMed Central  Google Scholar 

  42. 42.

    Vitiello MV, McCurry SM, Shortreed SM, Baker LD, Rybarczyk BD, Keefe FJ, Von Korff M. Short-term improvement in insomnia symptoms predicts long-term improvements in sleep, pain, and fatigue in older adults with comorbid osteoarthritis and insomnia. Pain. 2014;155(8):1547–54.

    PubMed  PubMed Central  Article  Google Scholar 

  43. 43.

    Forman DE, Maurer MS, Boyd C, Brindis R, Salive ME, Horne FM, Bell SP, Fulmer T, Reuben DB, Zieman S, et al. Multimorbidity in older adults with cardiovascular disease. J Am Coll Cardiol. 2018;71(19):2149–61.

    PubMed  PubMed Central  Article  Google Scholar 

  44. 44.

    Baker F.C. YD, de Zambotti M.: Sex differences in sleep. In: Sleep disorders in women edn. Edited by Attarian H. V-SM: Humana Cham; 2020.

  45. 45.

    Belvederi Murri M, Pariante C, Mondelli V, Masotti M, Atti AR, Mellacqua Z, Antonioli M, Ghio L, Menchetti M, Zanetidou S, et al. HPA axis and aging in depression: systematic review and meta-analysis. Psychoneuroendocrinology. 2014;41:46–62.

    CAS  PubMed  Article  PubMed Central  Google Scholar 

  46. 46.

    Burford NG, Webster NA, Cruz-Topete D. Hypothalamic-pituitary-adrenal axis modulation of glucocorticoids in the cardiovascular system. Int J Mol Sci. 2017;18(10):2150.

  47. 47.

    van Dalfsen JH, Markus CR. The influence of sleep on human hypothalamic-pituitary-adrenal (HPA) axis reactivity: a systematic review. Sleep Med Rev. 2018;39:187–94.

    PubMed  Article  PubMed Central  Google Scholar 

  48. 48.

    Morgan E, Schumm LP, McClintock M, Waite L, Lauderdale DS. Sleep characteristics and daytime cortisol levels in older adults. Sleep. 2017;40(5):zsx043.

  49. 49.

    Elder GJ, Wetherell MA, Barclay NL, Ellis JG. The cortisol awakening response--applications and implications for sleep medicine. Sleep Med Rev. 2014;18(3):215–24.

    PubMed  Article  PubMed Central  Google Scholar 

  50. 50.

    Buckley TM, Schatzberg AF. On the interactions of the hypothalamic-pituitary-adrenal (HPA) axis and sleep: normal HPA axis activity and circadian rhythm, exemplary sleep disorders. J Clin Endocrinol Metab. 2005;90(5):3106–14.

    CAS  PubMed  Article  PubMed Central  Google Scholar 

  51. 51.

    Irwin MR, Olmstead R, Carroll JE. Sleep disturbance, sleep duration, and inflammation: a systematic review and meta-analysis of cohort studies and experimental sleep deprivation. Biol Psychiatry. 2016;80(1):40–52.

    PubMed  Article  PubMed Central  Google Scholar 

  52. 52.

    Gallo J, Raska M, Kriegova E, Goodman SB. Inflammation and its resolution and the musculoskeletal system. J Orthop Translat. 2017;10:52–67.

    PubMed  PubMed Central  Article  Google Scholar 

  53. 53.

    Smith KJ, Au B, Ollis L, Schmitz N. The association between C-reactive protein, Interleukin-6 and depression among older adults in the community: a systematic review and meta-analysis. Exp Gerontol. 2018;102:109–32.

    CAS  PubMed  Article  PubMed Central  Google Scholar 

  54. 54.

    Fabbri E, An Y, Zoli M, Simonsick EM, Guralnik JM, Bandinelli S, Boyd CM, Ferrucci L. Aging and the burden of multimorbidity: associations with inflammatory and anabolic hormonal biomarkers. J Gerontol A Biol Sci Med Sci. 2015;70(1):63–70.

    CAS  PubMed  Article  PubMed Central  Google Scholar 

  55. 55.

    Brown RE, Basheer R, McKenna JT, Strecker RE, McCarley RW. Control of sleep and wakefulness. Physiol Rev. 2012;92(3):1087–187.

    CAS  PubMed  PubMed Central  Article  Google Scholar 

  56. 56.

    Daut RA, Fonken LK. Circadian regulation of depression: a role for serotonin. Front Neuroendocrinol. 2019;54:100746.

    CAS  PubMed  Article  PubMed Central  Google Scholar 

  57. 57.

    Melancon MO, Lorrain D, Dionne IJ. Exercise and sleep in aging: emphasis on serotonin. Pathol Biol (Paris). 2014;62(5):276–83.

    CAS  Article  Google Scholar 

  58. 58.

    Sieminski M, Szypenbejl J, Partinen E. Orexins, sleep, and blood pressure. Curr Hypertens Rep. 2018;20(9):79.

    PubMed  PubMed Central  Article  Google Scholar 

  59. 59.

    Clark JW, Brian ML, Drummond SPA, Hoyer D, Jacobson LH. Effects of orexin receptor antagonism on human sleep architecture: a systematic review. Sleep Med Rev. 2020;53:101332.

    PubMed  Article  PubMed Central  Google Scholar 

  60. 60.

    Schmid SM, Hallschmid M, Schultes B. The metabolic burden of sleep loss. Lancet Diabetes Endocrinol. 2015;3(1):52–62.

    CAS  PubMed  Article  Google Scholar 

  61. 61.

    Cunnington D, Junge M. Chronic insomnia: diagnosis and non-pharmacological management. BMJ. 2016;355:i5819.

    PubMed  Article  PubMed Central  Google Scholar 

  62. 62.

    van der Zweerde TB, L.; Kyle, S.D.; Lancee, J.; van Straten, A.: Cognitive behavioral therapy for insomnia: a meta-analysis of long-term effects in controlled studies. Sleep Medicine Reviews (In Press) 2019.

  63. 63.

    Virta JJ, Heikkila K, Perola M, Koskenvuo M, Raiha I, Rinne JO, Kaprio J. Midlife sleep characteristics associated with late life cognitive function. Sleep. 2013;36(10):1533–41 1541A.

    PubMed  PubMed Central  Article  Google Scholar 

  64. 64.

    Robichaud-Halle L, Beaudry M, Fortin M. Obstructive sleep apnea and multimorbidity. BMC Pulm Med. 2012;12:60.

    PubMed  PubMed Central  Article  Google Scholar 

  65. 65.

    Ruel G, Martin SA, Levesque JF, Wittert GA, Adams RJ, Appleton SL, Shi Z, Taylor AW. Association between multimorbidity and undiagnosed obstructive sleep apnea severity and their impact on quality of life in men over 40 years old. Glob Health Epidemiol Genom. 2018;3:e10.

    CAS  PubMed  PubMed Central  Article  Google Scholar 

  66. 66.

    Fabbri E, Zoli M, Gonzalez-Freire M, Salive ME, Studenski SA, Ferrucci L. Aging and multimorbidity: new tasks, priorities, and frontiers for integrated gerontological and clinical research. J Am Med Dir Assoc. 2015;16(8):640–7.

    PubMed  PubMed Central  Article  Google Scholar 

  67. 67.

    Leng Y, Musiek ES, Hu K, Cappuccio FP, Yaffe K. Association between circadian rhythms and neurodegenerative diseases. Lancet Neurol. 2019;18(3):307–18.

    PubMed  PubMed Central  Article  Google Scholar 

  68. 68.

    Dzierzewski JM, Martin JL, Fung CH, Song Y, Fiorentino L, Jouldjian S, Rodriguez JC, Mitchell M, Josephson K, Alessi CA. CBT for late-life insomnia and the accuracy of sleep and wake perceptions: results from a randomized-controlled trial. J Sleep Res. 2019;28(4):e12809.

    PubMed  PubMed Central  Article  Google Scholar 

Download references

Acknowledgements

The authors would like to thank all the SNAC-K participants as well as the SNAC-K study team for their time and their valuable contributions.

Funding

This work was supported by the funders of The Swedish National study of Aging and Care (SNAC): the Ministry of Health and Social Affairs, Sweden; the participating county councils and municipalities; and the Swedish Research Council. Shireen Sindi receives support from Alzheimerfonden, Demensförbundet, Karolinska Institute Foundation and Funds (KI Stiftelser och Fonder) and Loo and Hans Osterman Foundation for Medical Research. Amaia Calderón-Larrañaga received grants from the Swedish Research Council (2016-00981) and the Swedish Research Council for Health, Working Life and Welfare (2017-01764). Miia Kivipelto receives research support from the Alzheimer’s Research & Prevention Foundation, Academy of Finland (SALVE and 278457, 305810, 317465), Finnish Social Insurance Institution, Finnish Ministry of Education and Culture, Juho Vainio Foundation (Finland), Joint Programme - Neurodegenerative Disease Research (MIND-AD and EURO-FINGERS), Alzheimerfonden (Sweden), Swedish Research Council, Center for Innovative Medicine (CIMED) at Karolinska Institutet, Region Stockholm (ALF, NSV), AXA Research Fund, Knut and Alice Wallenberg Foundation (Sweden), Stiftelsen Stockholms sjukhem (Sweden), Konung Gustaf V:s och Drottning Victorias Frimurarstiftelse (Sweden), and Swedish Research Council for Health, Working Life and Welfare (FORTE). Open Access funding provided by Karolinska Institute.

Author information

Author notes

  1. Shireen Sindi and Laura M Pérez contributed equally as first authors.

  2. Marco Inzitari and Amaia Calderón-Larrañaga contributed equally as last authors.

Affiliations

  1. Division of Clinical Geriatrics, Center for Alzheimer Research, Karolinska Institutet, Stockholm, Sweden

    Shireen Sindi & Miia Kivipelto

  2. Neuroepidemiology and Ageing Research Unit, School of Public Health, Imperial College London, London, UK

    Shireen Sindi & Miia Kivipelto

  3. Aging Research Center, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet and Stockholm University, Stockholm, Sweden

    Laura Monica Pérez, Davide L. Vetrano, Federico Triolo, Ingemar Kåreholt, Linnea Sjöberg, Alexander Darin-Mattsson & Amaia Calderón-Larrañaga

  4. REFiT Barcelona Research Group, Vall d’Hebrón Research Institute and Parc Sanitari Pere Virgili, Barcelona, Spain

    Laura Monica Pérez & Marco Inzitari

  5. Centro di Medicina dell’Invecchiamento, IRCCS Fondazione Policlinico “A. Gemelli” and Catholic University of Rome, Rome, Italy

    Davide L. Vetrano

  6. Institute of Gerontology, School of Health and Welfare, Aging Research Network – Jönköping (ARN-J), Jönköping University, Jönköping, Sweden

    Ingemar Kåreholt

  7. Institute of Public Health and Clinical Nutrition and Institute of Clinical Medicine, Neurology, University of Eastern Finland, Kuopio, Finland

    Miia Kivipelto

  8. Theme Aging, Karolinska University Hospital, Stockholm, Sweden

    Miia Kivipelto

  9. Research and Development Unit, Stockholms Sjukhem, Stockholm, Sweden

    Miia Kivipelto

  10. Department of Medicine, Universitat Autònoma de Barcelona, Barcelona, Spain

    Marco Inzitari

Authors
  1. Shireen Sindi
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Laura Monica Pérez
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Davide L. Vetrano
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Federico Triolo
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Ingemar Kåreholt
    View author publications

    You can also search for this author in PubMed Google Scholar

  6. Linnea Sjöberg
    View author publications

    You can also search for this author in PubMed Google Scholar

  7. Alexander Darin-Mattsson
    View author publications

    You can also search for this author in PubMed Google Scholar

  8. Miia Kivipelto
    View author publications

    You can also search for this author in PubMed Google Scholar

  9. Marco Inzitari
    View author publications

    You can also search for this author in PubMed Google Scholar

  10. Amaia Calderón-Larrañaga
    View author publications

    You can also search for this author in PubMed Google Scholar

Contributions

Study concept and design: S. Sindi, L.M. Pérez, M. Inzitari, and A. Calderón-Larrañaga. Drafting of the manuscript: S. Sindi and L.M. Pérez. Data interpretation and critical revision of the manuscript: S. Sindi, L.M. Pérez, D.L. Vetrano, F. Triolo, I. Kåreholt, L. Sjöberg, A. Darin-Mattsson, M. Kivipelto, M. Inzitari, and A. Calderón-Larrañaga. Statistical analysis: L.M. Pérez and A. Calderón-Larrañaga. Obtained funding: S. Sindi, M. Kivipelto, and A. Calderón-Larrañaga. Study supervision: M. Kivipelto, M. Inzitari, and A. Calderón-Larrañaga. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Shireen Sindi.

Ethics declarations

Ethics approval and consent to participate

SNAC-K was approved by the Regional Ethical Review Board in Stockholm in Sweden. Written informed consent was collected from all participants. If the participant was not capable of providing such consent, it was obtained from a close relative or, eventually, from the legal guardian.

Consent for publication

Not applicable

Competing interests

None of the authors has any competing interests.

Additional information

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Supplementary Information

Additional file 1:

Supplementary Table 1. Baseline sociodemographic, clinical and lifestyle characteristics of the study population by age and sex. Supplementary Table 2. Association between type of sleep disturbance at baseline and rate of total and specific groups of chronic disease accumulation throughout the nine-year follow-up. Supplementary Table 3. Baseline distribution of most prevalent cardiovasculara (CV), neuropsychiatricb (NP) and musculoskeletalc (MSK) chronic diseases by presence and severity of sleep disturbances. Supplementary Table 4. Association between presence and severity of sleep disturbances at baseline and rate of cardiovascular (CV), neuropsychiatric (NP) and musculoskeletal (MSK) chronic disease accumulation throughout the nine-year follow-up. Analyses performed after removing most prevalent chronic conditions, one at a time, from each group of chronic diseases. Supplementary Table 5. Association between presence and severity of sleep disturbances at baseline and rate of total and specific groups of chronic disease accumulation throughout the nine-year follow-up. Analyses excluding participants with dementia or cognitive impairment at baseline. Supplementary Table 6. Association between presence and severity of sleep disturbances at baseline and rate of total and specific groups of chronic disease accumulation throughout the nine-year follow-up. Analyses excluding participants with depression at baseline*.

Rights and permissions

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Sindi, S., Pérez, L.M., Vetrano, D.L. et al. Sleep disturbances and the speed of multimorbidity development in old age: results from a longitudinal population-based study. BMC Med 18, 382 (2020). https://doi.org/10.1186/s12916-020-01846-w

Download citation

Keywords

  • Sleep disturbances
  • Multimorbidity
  • Aging
  • Cardiovascular
  • Neuropsychiatric
  • Musculoskeletal

BMC Medicine

ISSN: 1741-7015

Contact us