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.
Timing of light exposure, sleep and wake when the midpoint of light exposure (1, 2, or 3 h) was targeted to be 3 h before the core body temperature minimum (CBTmin). The CBTmin is at 05:30 for this example. Fifteen minutes of intermediate illumination and 4 h of sleep were scheduled before and after the bright light exposure.
