This could give you nightmares: 1 in 24 U.S. adults say they recently fell asleep while driving. And health officials think the number is probably higher. That's because some people don't realize it when they nod off for a second or two behind the wheel. In a government study released Thursday, a little over 4 percent of U.S. adults said they fell asleep while driving at least once in the previous month.
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