Loading…
Yes. The U-shaped mortality curve is well-replicated — short and very long sleep both worsen outcomes.
Mortality U-curve replicated in dozens of cohorts: <6 and >10 hours both raise risk.
Our read is Well Supported. The intervention clears a strong evidence base (88/100) with broad agreement among the voices we track (94% consensus). At $0/month and medium effort, getting 7–9 hours of sleep is one of the more defensible moves on this list — the burden of proof has largely been met.
Pulled the public claims about getting 7–9 hours of sleep from proponents on file (a tracked voice, a tracked voice, and a tracked voice) and weighed them against the more cautious voices in the field, then cross-checked each against the primary trial and cohort literature and the prevailing clinical guidance. We grade the claim against what the human evidence actually supports, not against how confidently it is stated.
Downside risk on getting 7–9 hours of sleep is low at sensible doses, but low risk is not no risk: individual response varies, and a low-risk intervention is still only worth it if the benefit is real.
Every Sunday: the week’s new conflicts and verdict changes — and nothing else.
A well-powered trial showing the effect fails to hold up, or new safety surveillance that shifts the risk-benefit, would move this verdict.
Mechanistic and trial evidence converge on a real, replicable effect.
Mechanistic and trial evidence converge on a real, replicable effect.
Benefits hold across the populations where it's been tested.
The effect size is large enough to matter clinically, not just statistically.
Benefits hold across the populations where it's been tested.
Most of the support comes from short or small studies.
The headline effect shrinks once you account for trial quality.
Most of the support comes from short or small studies.
Animal-model results don't translate to the human protocol being recommended.
Confounding and publication bias inflate the apparent benefit.