[Daring Scylla]

this might sound hippy dippy to some but you can try
(a) warm milk - NOT tea, it usually has caffeine
(b) meditating
(c) not eating
before you sleep. Avoid really high-tension things, like movies that excite you, arguing, extensive exercise, or playing exciting games like Halo or skyrim or whatever you may play. I know I freak out at my pokemon games and if i play them right before bed i'm not getting to sleep any time soon.
sleeping in a different bed, room or position may help. consider if the sheets or the pillow is what's keeping you up. Are you comfortable in your bed?
also think about what kind of lighting situation you have going on in your room when you go to bed. I know I can't sleep without some sort of light. stupid as it sounds, total darkness tends to wake me up.