Research & Discoveries
Sleep Duration, Fragmentation, and Cognitive Decline in Midlife Adults
Both short and long sleep durations associate with accelerated cognitive aging markers.
What was studied?
Researchers tracked 5,600 adults aged 45–65 for eight years, measuring sleep via actigraphy and cognitive performance via standardized neuropsychological batteries.
Key findings
- Sleep duration below 6 hours or above 9 hours associated with faster episodic memory decline.
- Sleep fragmentation (frequent awakenings) independently predicted executive function decline.
- Apnea-hypopnea index > 15 substantially mediated the association between sleep and cognitive outcomes.
- Effects were strongest in participants with APOE ε4 carrier status.
Why it matters for longevity
Cognitive longevity begins decades before symptoms. Sleep assessment — including screening for obstructive sleep apnea — should be standard in midlife preventive evaluations.
Clinical perspective
KCM includes sleep architecture review in comprehensive longevity assessments. When apnea or severe fragmentation is identified, we coordinate with sleep medicine specialists before pursuing other cognitive optimization strategies.
Original publication
Source reference
Sleep Duration, Fragmentation, and Cognitive Decline in Midlife Adults
JAMA Neurology · 2025
DOI: 10.1001/jamaneurol.2025.2847
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