Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Forest plot of the risk of death associated with long duration of sleep compared to the reference group in 27 population cohorts from 16 published prospective studies including 1,382,999 participants and 112,566 events. Results are expressed as relative risk (RR) and 95% confidence intervals (95% CI). Pooled analysis P < 0.0001; heterogeneity test: I2 = 71%, P < 0.0001
