In the month before the competition, he stayed awake for days at a time to finish the collection.

CNN: Why the other Fashion Weeks matter

Most travelers arrive in a new time zone, take a sleeping pill to fall asleep at bedtime, drink coffee during the day to stay awake, and wait it out until they feel better, says Charmane Eastman, a professor of behavioral sciences at Rush University Medical Center in Chicago, who has devised strategies for people seeking to minimize jet lag.

WSJ: To Avoid Jet Lag This Summer, Travel Like a Scientist

In addition to keeping a prisoner awake, the simple act of remaining upright can over time cause significant pain.

NEWYORKER: The Black Sites

It's not just a matter of the extra time being awake, that there is something about being tired that seems to contribute.

NPR: 10 More Possible Triggers to Obesity

Many instead come in a day early or leave a day later to accommodate airline schedules and to be awake and alert for classes that are several time zones earlier or later than their own.

WSJ: Traveling the Globe -- Just to Get to Class