You would probably be most concerned if you were being driven somewhere by a person who has the sleep disorder called

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Quizplus · Accepted Answer

Narcolepsy is a sleep disorder characterized by excessive daytime sleepiness and sudden attacks of sleep, which can be extremely dangerous if the person is driving.  This disorder causes sudden irresistible sleepiness and is often accompanied by cataplexy, the sudden loss of muscle control.

You Would Probably Be Most Concerned If You Were Being