I used to drive a lot and and would regularly become extremely, and indeed dangerously, sleepy. I recall reading at the time that sleeping for around 12 minutes

I used to drive a lot and and would regularly become extremely, and indeed dangerously, sleepy. I recall reading at the time that sleeping for around 12 minutes would relieve sleepiness, but that any more than that would actually make you more tired. After doing no research whatsoever, I put this into practice, and it worked, remarkably well. And it still does, 15 years later, though I drive a lot less now. I recommend it to anyone with the same problem. [edit] when I say it worked well, I mean that after that short sleep (using an alarm of course, without which I would have slept for hours), I could continue driving for several hours without feeling sleepy again.