Cohort Studyhigh evidence
Changes in Nighttime Sleep Duration and Their Association With Cognitive Decline and Dementia Risk.
Journal of sleep research·July 28, 2026·PMID 42522237
Why it mattersSleep duration changes, especially lengthening and high night-to-night variability, may serve as early behavioral markers of neurodegenerative processes, offering clinicians a simple, non-invasive clue for identifying older adults at higher risk of cognitive decline and dementia.
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