Best way to get 3-5 hours of sleep a night, applying "phase" idea?

[Erock]

Obviously the premise of polyphasic sleeping is to only sleep a limited amount of time and still feel great throughout the day. If you take a 20 minute nap every 4 hours that works great, but what if you want to get an hour or two more sleep then that? Sleeping 20 minutes every 2 hours would be nearly impossible. I'm going to be a college student next year, and I'm thinking I probably won't get that much sleep anyway, so I might as well learn how to sleep in a way that lets me still feel good throughout the day.

Has anyone successfully implemented a sleep strategy that lets them get 3-5 hours of sleep a night and still feel great, and done it for a long period of time?

Thanks a ton
Erock