I'm not a good sleeper, never have been, but here's a few tricks that sometimes help me.
Do you know any long piece of poetry or prose by heart? I use "The Owl and the ***** Cat" or "The Jabberwocky." Get into your comfortable sleeping position, close your eyes and recite to yourself that piece. Focus on each word. Any thing you know by heart will work. Even technical manuals or whatever.
I have the best luck with meditation tapes. I have quite a few on my iPod so I use the ear buds. I like "Deep Sleep with Medical Hypnosis." It works faster if used regularly.
Try to get a walk in for about 20-30 minutes each day, early on. The ambient light helps the body clock reset itself. Stick to a regular sleep schedule. Take the TV and computer out of the bedroom. As barb says, a fan with a soft hum will help and keep the room cool. Use extra blankets for warmth. Sometimes I use a hot water bottle on my tummy.
I hope this helps.
Love,
Lenina