Driving while drowsy is like driving under influence of alcohol. You are three times more likely to be in a car crash if you are fatigued. Sleepiness can slow down your reaction time, decrease awareness, impair judgment, and increase your risk of crashing. The best way to prevent drowsy driving is to get enough sleep or ask someone else to drive if you do not feel alert. For more information visit https://www.thensf.org/drowsy-driving-prevention/
Original source can be found here.