Finding our way down to camp would be the hardest part of the climb, crawling into our sleeping bags after being awake for 42 hours.

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Avoid sending any messages while most people are sleeping, even if you're wide awake.

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Gregg said he would have trouble sleeping after taking the pills, often remaining awake and alert into the early hours of the morning.

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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.

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Noticing the circadian pattern of Charles B's depression, Dr Wehr asked him to get through a night without sleeping, and then to increase his nightly sleep only gradually, so that for almost a week he was awake during those crucial early-morning hours.

ECONOMIST: People, like all living things, are four dimensional