[kouichisan]

I am the same, I have a really difficult time sleeping some days... too much uni work stressing me out. Once I only got about three hours sleep and I had work the next day! that didn't feel too good.

If you drink loads of caffeine... try to cut down on it.
Try to relax a bit more, if there is something troubling you maybe you should talk to someone you trust, less to bear with.
Try to get to bed on time, rather than having irregular sleeping patterns.
Don't take sleeping pills cos you'll just get addicted to them!
If non of it works... see a doctor.