Which of the following is a recognized early warning sign of driver fatigue described in the AAMVA CDL Manual?

AAMVA CDL Manual (nhcdm.pdf) Section 2.11.2, p. 2-25

Recognizing these warning signs early gives a driver the chance to pull over and rest before fatigue causes a lane drift or a missed hazard. Waiting until a driver is already struggling to stay awake is often too late to prevent a crash.