I've had better results with a siesta schedule -- 6 hours asleep at night, half-hour nap during the day, awake for both night life and morning obligations and nobody thinks you're crazy (as they would with the Everyman schedule).
The Wikipedia page on Sleep actually covers the current theories pretty well, including this article's hypothesis and a rebuttal to it.
if my school and work didn't interfere, i'd try the 28-hour day... http://xkcd.com/320/
also: http://xkcd.com/571/