@newagelongevity: Sleeping 7 hours a night in your 50s and 60s was linked to a lower risk of dementia than sleeping 6 hours or less, which carried up to 37% higher risk. The Whitehall II study followed 7,959 London civil servants for 25 years and asked about their sleep at 50, 60 and 70. 521 developed dementia. Against 7 hours, 6 hours or less was linked to 22% higher risk at 50, 37% higher at 60 and 24% higher at 70, though the age 70 figure was less certain. People who slept 6 hours or less at all three ages had 30% higher risk than people who slept 7 hours at all three, after accounting for income, habits, heart health and mental health. The sleep that counted came in midlife, decades before any diagnosis.

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Sunday 08 November 2026 06:46:57 GMT