Figure 5. Nocturnal sleep efficiency of each of the weeks, recorded for 17 work-stressed nurses (X ± S.E.).
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.