Nighttime sleep 4-6 h

Nighttime sleep 4-6 h lowers the risk of premature death in humans (HR 0.522, p = 0.039).

“females with 4-6 h of nighttime sleep had a lower risk of premature death (hazard ratio = 0.522, p = 0.039).”

Humansadjusted for covariates2 yearsfemalesn = 11,054

Nighttime sleep, midday napping, and mortality in Chinese older adults: A China Health and Retirement Longitudinal Study longitudinal cohort study

The Journal of international medical research·6 Aug 2026