Overview

• The study analyzed data from 1,853 dementia-free adults as part of the Framingham Heart Study, focusing on sleep duration and cognitive health.
• Participants sleeping over nine hours nightly showed significant declines in memory, visuospatial skills, and executive functions.
• Individuals with depressive symptoms experienced the most pronounced cognitive impairments from excessive sleep.
• Researchers hypothesize that disrupted circadian rhythms and impaired amyloid-beta clearance may underlie the negative effects of long sleep durations.
• Experts recommend seven to eight hours of sleep per night to support cognitive health and potentially reduce dementia risk.