Epidemiological research has also documented a U-shaped association between sleep duration and cognitive decline, indicating a significant trend in the association between sleep duration and functional disability [ 45 - 47 ].
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Sleep Duration and Functional Disability Among Chinese Older Adults: Cross-Sectional Study.
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Respondents with functional disability showed an increasing trend in sleep duration after the age of 75 years (mean change per 1 age point later in life of 0.09 hours).