Here are a few suggestions nobody has really covered:
1) try decaf coffee and tea
2) try it again, it will eventually grow on you like a fungus
3) Yoga can work very well, but who has that much time and patience before bed? Try stretching exercises (3-8 minutes; just like you are warming up for aerobics) but don't bounce or bob up and down. That is really bad for your muscles. keep it slow and steady. clear your mind (not so easy is it?) Imagine you are in a cave. blackness. no sound. you have lit a small candle and placed it directly in front of you. you focus on the candle's flame and the very dim light it extrudes. you can see nothing beyond the flame. there IS nothing beyond the flame. the cave is damp and slightly cool, the light of the candle provides a feeling of warmth. solitude.
focus on the warmth...
The cave contained methane deposits, it exploded when you lit the candle. You are dead and now have plenty of time to rest...
4) meditation was suggested many times, but most people don't even know where to start. Many just close their eyes and try to think of nothing. Ain't happenin'. Bills, Mortgage, Insurance premiums, I hate my in-laws, the dog pissed on the floor yesterday and it still stinks - whatever was troubling you in the first place will eventually become the focus and just piss you off again.
Find something that makes you feel relaxed and focus on it. No Carousel Rides! No Surfing Adventures! No Roller Coasters! Find something that is relaxing - not fun or exciting. Imagine you are in a sauna with your eyes closed... You're wading in a tropical lagoon... You're sitting on a cliff atop the grand canyon... You're sitting near a bonfire at dusk, with your horse "Shooter" and your pistol "Lucky"...
Whatever you can think of that is relaxing for you, that is what you should use as your focus. Try laying in bed, while imagining you're in a cave with a warm candle and absolutely nothing else, for longer than 10 minutes without falling asleep. It's hard to do. Try meditating at your desk when your nerves are shot, or after you just lost a chunk of money. 4-5 minutes in the middle of the Sahara desert with no wind, no animals, no people, no plants, nothing but yellow sand and blue sky. And you'll find out that whatever was bothering you 5 minutes ago isn't so bad after all.