A large body of evidence supports the fact that your accident risks increase when you are driving in a fatigued condition. But just how sleepy do you have to be to be involved in an accident? According to a new study, your accident risk doubles if you have lost just a single hour of sleep.
A staggering new study by the AAA Foundation for Traffic Safety underscores the dangers of drowsy driving. According to the study, missing just an hour or two of sleep doubles your chances of being involved in a car accident the next day. If you drive after getting just 4 to 5 hours of sleep, your accident risk increases by four times. In fact, at that level, you are driving in a state that is comparable to that of a person with a blood-alcohol concentration between .12 and .15. That is higher than the .08 drunk driving limit in place in most states.
There are many studies on driving while tired, but this is the first one that aims to quantify the dangers.