I'm going to start this post with a few shamelessly "borrowed" quotes from Cracked.com, mmk? The writer of the 5 Ways to Hack Your Brain into Awesomeness post has phrased it so much better than I ever could:
"What if we told you there was a way to sleep for little more than two hours a day, and still feel more refreshed than taking a 12-hour siesta on a bed made entirely out of baby kitten fur?
"It's called the Uberman Sleep Schedule, and besides having a totally badass name, it's a way to get the maximum amount of essential sleep for your body without wasting hours of precious time you could be using to work or drink or farm for World of Warcraft gold. The schedule consists of taking six, 20-30 minute power naps, every four hours during the day. Of course, this new sleep pattern blows donkey-dick to get used to, but it's a price you have to pay to basically extend your waking life by several years.