Fig. 1.
Three days of sleep/wake activity. Note that this is a double plot such that the second 24-h period (day 2) on the first line is repeated as the first 24-h period on the second line, etc
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.