Cappuccio’s group pooled more than a million people. Both short and long habitual sleep predicted higher death risk. U-shaped, messy, and still the paper people cite when they tell you to protect the night.
Research
Strong evidence
Sleep duration and all-cause mortality (Cappuccio 2010)
Classic meta-analysis of short and long sleep.
Details
- Authors
- Cappuccio FP, D’Elia L, Strazzullo P, Miller MA
- Publication
- Sleep
- Published
- 2010
- Abstract
- Across 16 prospective studies and 27 cohorts, short sleep raised all-cause mortality (RR 1.12) and long sleep raised it further (RR 1.30), with heterogeneity but no clear publication bias.
- Full text
- https://doi.org/10.1093/sleep/33.5.585
- Key findings
- U-shaped association: both short and long habitual sleep predicted death in population cohorts.
- Methodology
- Systematic review and random-effects meta-analysis of prospective studies with more than 3 years of follow-up.
Editorial rating ★ 4.6
Observational U-curve. Do not treat 9 hours as a toxin; treat 5 hours as a warning.
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