I'll Sleep On That.

http://content.usatoday.com/communities/sciencefair/post/2010/02/dont-knock-naps-they-make-you-smarter/1
Don't knock naps, they make you smarter

The longer we stay awake, the less able our brains are to learn.

If this is true, then I think I know a few people who have been awake for more than a few weeks.