Things I must do before bed:
Play sims
Watch King of the Hill (inb4: lulz), possibly even family guy
Go on AIM
Things that make me sleepy:
My blood pressure medicine
my crazy thoughts
But if you're having sleep problems, please consult a doctor, as they can schedule a sleeping test and find out what's really wrong.
Edit: You can also take melatonine (it's a otc sleeping pil), but if you use it too much you can become dependent and it stops working. Happened to me a few times.