There are many warning signs that all mean you are too tired to drive. These are usually the first:
It is important to recognize and listen to your body's signs of fatigue. Never driver if you are too tired!
If you experience any of the following, you are really tired and about to fall asleep:
Alcohol makes us both tired and less attentive to signs of fatigue. Therefore, it is common that fatigue-based accidents are caused by drunk drivers.