Sixty-two percent of drivers in the United States admit having driven while they were so tired they had a hard time keeping their eyes open. Among them, a quarter – the equivalent of approximately 37 million adults – report doing so at least once a year, or more often than that.

That’s the case even though 95 percent of adults call drowsy driving extremely or very risky.  Even among drivers who call it extremely risky, six in 10 say they have driven drowsy at some point.

Results are from a survey we produced for the National Sleep Foundation in conjunction with its 15^th annual Drowsy Driving Week. See the full report here and more information about Drowsy Driving Week here.