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Sleep Disturbances and Dementia Risk in Older Adults: Findings From 10 Years of National U.S. Prospective Data
Journal Title
American Journal of Preventive Medicine
Readers/Advisors
Journal Title
Term and Year
Publication Date
2023-06
Book Title
Publication Volume
64
Publication Issue
6
Publication Begin
781
Publication End
787
Number of pages
Research Projects
Organizational Units
Journal Issue
Abstract
Introduction:
Prior research has identified a link between sleep disturbances and cognitive impairment, however, no study has examined this relationship using a national U.S. sample. This study examines how multiple longitudinal measures of sleep disturbances (sleep-initiation insomnia, sleep-maintenance insomnia, sleep medication usage) are associated with dementia risk.
Methods:
Ten annual waves (2011–2020) of prospective cohort data from a nationally representative U.S. sample of older adults age 65 and older were analyzed from the National Health and Aging Trends Study (NHATS). Sleep disturbances were converted into a longitudinal score and measured as sleep-initiation insomnia (trouble falling asleep in 30 minutes), sleep-maintenance insomnia (trouble falling asleep after waking up early), and sleep medication usage (taking medication to help sleep). Cox regression models analyzed time to dementia diagnosis for a sample of 6,284 respondents.
Results:
In the unadjusted model, sleep-initiation insomnia was significantly associated with a 51% increased dementia risk (hazard ratio [HR]=1.51, 95% confidence interval [CI]=1.19–1.90). Adjusted for sociodemographics, sleep medication usage was significantly associated with a 30% increased dementia risk (aHR=1.30, 95% CI=1.08–1.56). Adjusted for sociodemographics and health, sleep-maintenance insomnia was significantly associated with a 40% decreased dementia risk (aHR=0.60, 95% CI=0.46–0.77).
Conclusions:
These findings suggest sleep-initiation insomnia and sleep medication usage may elevate dementia risk. Based on the current evidence, sleep disturbances should be considered when assessing the risk profile for dementia. Future research is needed to examine other sleep disturbance measures and to explore mechanisms for decreased dementia risk among older adults with sleep-maintenance insomnia.