i did 49 just last week...woke up sunday morning at about 9(after a bachelor party!)...hung around the house until about 11pm...left for vacation at Hilton Head, got down there, thought about napping, then thought about the beach...of course the beach won...then the bars and more drinking...after breakfast finally got to bed Tues morning around 11ish. and i still only catnapped for about 3hrs before going to the beach again!
i've heard that the British Commandos, or whatever they're called have to train one mission staying awake for an entire 72hrs, and still be able to function.