As little as 20 hours without sleep leaves you with the same impaired attention and slow reflexes of someone who is legally drunk. Chris Eatough, six-time winner of the World Solo 24 Hours of Adrenaline Championship mountain-bike race, says that during a day-long competition, his vision will occasionally stop. "I'll be flying downhill with rocks and trees to dodge," he says, "and I'll get a snapshot of the trail that doesn't change for four or five seconds."
For Outside Magazine, I spent a night in a strip mall in Fremont with a bunch of electrodes attached to my head, doing a sleep evaluation. I can't say it was the best night I ever had, but it made me even more obsessed with my eight hours a day than I was before. And believe me when I say that I take my sleep seriously.