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Associations of sleep timing and time in bed with dementia and cognitive decline among Chinese older adults: A cohort study.
- Source :
- Journal of the American Geriatrics Society; Nov2022, Vol. 70 Issue 11, p3138-3151, 14p
- Publication Year :
- 2022
-
Abstract
- Background: The longitudinal associations of sleep timing and time in bed (TIB) with dementia and cognitive decline in older adults are unclear. Methods: This population‐based cohort study used data from 1982 participants who were aged ≥60 years, free of dementia, and living in rural communities in western Shandong, China. At the baseline (2014) and follow‐up (2018) examinations, sleep parameters were assessed using standard questionnaires. Cognitive function was measured using the Mini‐Mental State Examination (MMSE). Dementia was diagnosed following the DSM‐IV criteria, and the NIA‐AA criteria for Alzheimer disease (AD). Data were analyzed using restricted cubic splines, Cox proportional‐hazards models, and general linear models. Results: During the mean follow‐up of 3.7 years, dementia was diagnosed in 97 participants (68 with AD). Restricted cubic spline curves showed J‐shaped associations of sleep duration, TIB, and rise time with dementia risk, and a reverse J‐shaped association with mid‐sleep time. When sleep parameters were categorized into tertiles, the multivariable‐adjusted hazard ratio (HR) of incident dementia was 1.69 (95%CI 1.01–2.83) for baseline sleep duration >8 hours (vs. 7–8 h), 2.17 (1.22–3.87) for bedtime before 9 p.m. (vs. 10 p.m. or later), and 2.00 (1.23–3.24) for mid‐sleep time before 1 a.m. (vs. 1–1.5 a.m.). Early bedtime and mid‐sleep time were significantly associated with incident AD (HR range: 2.25–2.51; p < 0.05). Among individuals who were free of dementia at follow‐up, baseline long TIB, early bedtime and mid‐sleep time, early and late rise time, and prolonged TIB and advanced bedtime and mid‐sleep time from baseline to follow‐up were associated with a greater decline in MMSE score (p < 0.05). These associations with cognitive decline were statistically evident mainly among men or participants who were aged 60–74 years. Conclusions: Long TIB and early sleep timing are associated with an increased risk of dementia, and the associations with greater cognitive decline are evident only among older people aged 60–74 years and men. [ABSTRACT FROM AUTHOR]
- Subjects :
- COGNITION disorder risk factors
DEMENTIA risk factors
STATISTICAL significance
CONFIDENCE intervals
INDEPENDENT variables
MULTIVARIATE analysis
AGE distribution
INTERVIEWING
REGRESSION analysis
COGNITION
SEX distribution
SLEEP deprivation
DESCRIPTIVE statistics
STATISTICAL sampling
DATA analysis software
LONGITUDINAL method
PROPORTIONAL hazards models
EDUCATIONAL attainment
OLD age
Subjects
Details
- Language :
- English
- ISSN :
- 00028614
- Volume :
- 70
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Journal of the American Geriatrics Society
- Publication Type :
- Academic Journal
- Accession number :
- 160176442
- Full Text :
- https://doi.org/10.1111/jgs.18042