How do you overcome the feeling of being sleepy while driving?

United States
@Bebs08 (10702)
July 15, 2008 7:57pm CST
I have a friend who was into accident that almost lost her arm because she falls asleep while driving. It was early morning when she drives to work, she falls asleep while driving and hit the big tree beside the road. Her car was turn upside down leaving her hanging inside her car with her seatbelt. A woman who was walking with her dog saw the incident and call the police. Well, my friend was just fortunate that there was no other damage except her broken arm and nothing more. It is very dangerous when you fall asleep while driving. What you usually do to overcome your sleepiness while driving? are you chewing gums? play your music loud or what? well, please share.. thanks...