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Sleepiness occurs in almost everyone at some time during each day. If sleepiness becomes moderate to severe, it can have an impact on an individual's ability to perform tasks that are prolonged or require a high degree of concentration. Driving is a daily activity that usually involves repetitive behaviors over a prolonged period, and it may be adversely affected by an individual who is sleepy. Data from the Department of Transportation show that sleepiness and fatigue contribute to numerous accidents on the road. This article reviews information related to the effects of sleepiness on driving, the types of sleepiness, and some tools for assessing sleepiness.