Charles Czeisler talked about the dangers of drowsy driving at a recent Harvard T. H. Chan School of Public Health Forum called Asleep at the Wheel, reports Scientific American.

“And we just finally got a consensus group, the first consensus panel of experts, to agree that if an individual has had less than two hours of sleep in the previous 24 hours that that’s the equivalent of being negligent and should be added to the statutes. It’s just like drunk driving.