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.
Temporal changes in sleep duration among US adults aged ≥ 18 y, National Health Interview Survey. (A) Shift in the detailed age-adjusted distributions of sleep duration. (B) Shift in the age-adjusted distributions of sleep duration using three categories. (C) The age-adjusted prevalence ratios (95% confidence interval) for sleep ≤ 6 h in a 24-h period. (D) The age-adjusted prevalence ratios (95% confidence interval) for sleep ≥ 9 h in a 24-h period.
