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.
Amount of sleep obtained each hour for 9 participants permitted to sleep up to 7 minutes of every 20 minutes throughout the 24-hour day. Data were taken from figure 8 in Lavie and Segal.31 Horizontal axis is clock time of a 24-hour day beginning at midnight. The vertical axis represents minutes of sleep.
