The difference between night and day is not what it used to be for Tony Warren. After a couple of years of steady shift work, the 27-year-old Atlanta resident--a part-time waiter and full-time graduate student in computer engineering-- has embraced an existence of almost nonstop wakefulness that would turn most normal human beings into drooling, hallucinating zombies.
"My shifts are from 5 p.m. until 3 or 4 in the morning," he says. "When you get home late like that over and over again, then you just can't fall asleep as easy. So you stay up an hour. Then an hour becomes...
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