Why not just get yourself used to sleeping four or five hours a night and leave it at that?
I’ve read about this and IIRC it requires a pretty rigid schedule, doesn’t it? I could never stick to it.
I think as a society, we put too much pressure on ourselves to “do more”. At the end of the day, your body needs a certain amount of sleep and that’s that. If you have a completely open schedule, I would try just going to bed whenever I’m tired and waking up when I wake up. Don’t pressure yourself to conform to society’s schedule and you should end up sleeping exactly as long as your body wants/needs.
I remember reading an interesting article a while ago that said we aren’t made for sleeping 8 hours in a row like we do. Apparently, before the industrial age, people went to bed when it got dark, woke up for two or three hours in the middle of the night and talked (if they were married, I guess) and then went back to bed. The article suggested this was perhaps the most “natural” sleep cycle, but I don’t remember the details.
edit: found a link here.