I sort of have a sleeping problem. It takes me a good half an hour or more to fall asleep, even then I'll wake up two or four times in the 8-10hours that I 'sleep' during. The sleep I get is essentially broken sleep, been that way for quite a few years now. I don't even feel that refreshed after what I would consider a decent bout of sleep. One thing does help though, and that's reading just before I go to bed. The odd 50-100 pages of a book usually does the trick, anything less and it takes longer to sleep.
Try cutting down on caffeinated drinks, sugary foods or things that may give you huge bursts of energy in the one go. Listening to soothing sounds or reading before bed may even help. If your problem persists, just as Yogi_Bear said, seeing a doctor may be the best bet.