Drink some chamomile tea, then take 5mg of Melatonin about 20 mins before you go to sleep. Get the melatonin tablets that dissolve in your mouth. Melatonin is OTC and a natural sleep aid.
For whatever reason, if I'm having trouble sleeping, I turn on the tv and leave on like A&E or ESPN just running reruns of Duck Dynasty or Storage Wars. You don't watch the shows, just leave it on for background noise.