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.
Forced desynchrony (FD) protocol (A) and sleep inactivity-vs.-wake inactivity protocol (B) schemes. In both protocols, represent instances of blood draws. In the FD protocol, ○ represents an individual’s circadian period. DLMO, dim-light melatonin onset.
