It kills half as many people as drunk driving. You might’ve done it this morning.

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When I was 18, I fell asleep in bumper-to-bumper traffic and ran into the car in front of me. You might think that would have stopped me from driving while tired again, but in the decade since, I’ve found myself fighting sleepiness on the road more often than I’d like to admit. I’ve become well practiced at the crank-up-the-AC-and-music routine. More than once, I’ve pulled over in sketchy lots alongside the highway to take an emergency nap.

For a long time, being tired while driving felt inevitable: I was always tired, so I did everything tired, so of course I would be tired while driving. It wasn’t until last winter, when I went to a sleep specialist, that I re