Polyphasic sleep is a method for increasing the amount of time you spend awake during the day. By sleeping only twenty to thirty minutes every four hours you can stay awake longer. The short time you do spend sleeping the body is in REM sleep, which is the most restful phase. This technique has been used by many famous inventors. I first stumbled across this idea in an article on Kuro5hin. This mode of life can be very difficult to adjust to. In the first few days you probably won’t be asleep when you are trying to. You must strictly follow the sleep schedule. Skipping a nap will probably cause a major crash. With limited sleep a nutritious diet will become very important. Of course if you’d rather sleep more you’re probably better off with the 28 hour day.