Almost every motorist at some point or another driven while being too tired. This includes driving in a state in which they were frequently yawning, or nodding off to sleep while driving.
Drowsy driving is a silent killer on American roads, contributing to as many as one in six fatal accidents and thousands of injuries. However, there are no reliable ways to measure drowsiness, and motorists are very rarely likely to admit that they were indeed fatigued while driving. Therefore, the actual number of drowsy driving accidents is potentially much higher than estimated.
If you are driving, and notice yourself doing the following, it is time to pull over somewhere safe and take a break.