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Large pooled analyses of prospective cohorts show a U‑shaped association between nightly sleep duration and all‑cause mortality, with the lowest risk at roughly 7 hours/night. In a 2022 meta‑analysis of 16 studies including 1.4 million adults followed up to 20 years, sleeping ≤5 hours was linked to about a 15–25% higher all‑cause mortality risk, while ≥9 hours carried a similar… read the full issue →
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