Techniques to help sleep

there is something called biofeedback which is a way that you train your brain to help with various things like stress, anxiety, anger, sleep, etc.  you are trying to slow down your heart rate, in order to relax.  you can do this by focusing on the breathing or use other techniques (more later).  some doctors and clinics help people learn this by actually attaching sensors to your body so you can see how it works.

http://tlc.howstuffworks.com/family/natural-sleep-aids3.htm

the next thing to mention is 'guided imagery' -- in addition to focusing on your breathing, you can focus on a place.  for example my mom always used to teach me that i should start by imagining the place where i am most relaxed -- like imagnie you are on the beach, let's say, a very nice beautiful beach, long and white with sand, very peaceful with no children screaming, beautiful blue green water in front of you, not too hot, not too cold, and you are just laying there in the sun, etc.  you focus on that.  or you can focus on another place, you imagine yourself there and think about it, don't let your thoughts go anywhere else.

the one i like the most is called progressive relaxation:

http://www.umm.edu/sleep/relax_tech.htm

where you focus slowly on every single inch (sorry, i'm american, but for you let's say centimeter ) of your body, from head to toe and you concentrate on each place for few seconds and focus on relaxing every single muscle there.

try it and see.  or do other search on google for sleep relaxation techniques...