Driving And Yawning: Not Good
You can be driving while you are drowsy. And when you are drowsy, your concentration could get quite lessened. You would be yawning and you just feel like you would like to rest. For some people, they could even be driving while asleep with their eyes open, and thus the phrase falling asleep behind the wheel. This kind of situation could lead to accidents.
Fatigue and drowsiness is considered and counted as one of the major factors in crashes. It goes along with driving with excess speed, driving while on alcohol and drugs, as well as driving while ignoring other vehicles