This is a topic that really intrigues me.

I get by on very little sleep, I mean now its 00:30 here, and I need to be up at 08:00, and I won't even get to sleep until 02:00 at the earliest!

I occasionally pull all-nighters for no apparent reason, just because I don't want to sleep that night. And I'm always fine the next day, and even more worryingly sometimes in a better mood after (!?)

I remember one night a year or so ago, when I must of had as little as 2hrs sleep, and when I woke up after that short nap I felt - no joke - the best I had ever done in a very long time.

It also seems no matter how much sleep I get I find it so hard to wake up, well unless it's less than 2 hours it seems (presumably due to the fact that you don't reach the deep sleep stages or something).

I'm continually trying to work out a good sleeping pattern for myself.