Many people swear by polyphasic sleep, or the idea of taking frequent naps throughout the day as opposed to sleeping in one long chunk. Leonardo da Vinci was one of the most notable proponents of this seeping method, noting that it helped him be more productive throughout the day. This alarm clock concept follows da Vinci's 3.5 / .5 sleep schedule, meaning that an alarm will sound every 3 hours and 30 minutes indicating that it is time for a nap. Another alarm will sound a half hour later, indicating that it is time to wake up again. All-in-all, the da Vinci Sleep alarm clock will net you around 3 hours of shut-eye per day (although I have heard da Vinci slept even less than that). Obviously, a schedule like this isn't for someone who maintains a regular 9 to 5 schedule, or operates heavy machinery—but it would be perfect for bloggers, retired persons and the unemployed. This particular clock is only a concept, but you could set a regular alarm fairly easily to try this sleep method yourself. [Yanko]
I did this for a month while in College. Getting into the rhythm is extremely difficult. The idea is that you only need REM and the average person gets less than 3 hours of REM in 8 hours of sleep. Polyphasic sleep is about training your body to go into REM immediately and waking up before your body automatically comes out of REM. To train your body you basically spend about 2 weeks depriving yourself of sleep. Following these sleep cycles you are suppose to get more REM in 24 hours than a person who sleeps 8hours straight. I stopped just as it was starting to get easy because it doesn't go over well when you've got a pretty steady girlfriend, but it was definitely an interesting experiment.