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.
Means (and standard errors) of (A) high-fidelity driving simulator performance, (B) psychomotor vigilance test (PVT) performance, and (C) Karolinska Sleepiness Scale (KSS) subjective sleepiness, in the morning after the last of 5 consecutive night shifts (black) and after 3 consecutive days off duty (white).
