Maybe you can try supplements such as Melatonin. I find that Melatonin can really help me sleep.
There is also this calcium pills but I forgot its name. It claims to help people sleep too.
And another thing you can try is by using binaural beats that can be found free in the iTunes or just google for free binaural beats that can help you sleep.
One thing that works for me though is to watch movie by lying down. I get really sleepy and I find that my the TV is still on when I am awake tomorrow