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.
Sleep-stage percentage of inpatients versus age-matched normal control subjects. This figure shows sleep stages 1, 2, 3+4, and rapid eye movement (REM) as a percentage of total sleep time in the inpatient population studied, compared with age-matched normal controls.16
