I'd like to present another way of managing your sleep. It is called free-running sleep. The idea is very simple - just let your inborn sleep manager do it's job: go to sleep when you're tired, wake up naturally without an alarm clock.
This might seem impossible at first, mainly because the habit of using an alarm clock is quite deeply rooted in our society.
I myself have been a free-running sleeper for about 14 months now. It took me approx. a week to adjust to this "system" and then much longer to change my habits like not staying up late, not sitting in front of the computer right before going to sleep etc.
The main advantages I've observed: lots of energy, far better concentration and mood, also helps when you're about to get sick (I sleep longer and the body seems to always get over it very quickly). Not interrupting the sleep is also of an enormous importance when one studies a lot.
I recommend these articles very much... they're very long but don't be put off. They've been of a great benefit to me.
* Good sleep, good learning, good life
(esp. the part on free running sleep
* Formula for healthy sleep
by the same author.
If you have any questions, please ask. It's quite difficult to convince people of the benefits (however, I converted one of my friends (; ), but you never know until you try.