For anyone who has trouble sleeping, you should try a practice known as Yoga Nidra, literally meaning 'Yogic Sleep'..
This practice is usually done to help people connect to their subconcious..but I've found it useful in putting myself into a state of deep relaxation that it eventually puts me to sleep.
Basically to practice this for the purpose of sleep do the following:
1) While lying on your bed, put yourself into the
savasana position 2) Take 2-3 deep breaths (don't rush them, take 5 seconds to inhale, hold your breath for 2 seconds and exhale for another 5 seconds).
3) While exhaling, feel your body weight sink into the ground. All the tension/pressure/tightness in your body just let it sink and feel it being removed from your body.
4) Now picture you entire body being lit up internally with bright lights. One by one select each body part and imagine that you are shutting off these lights in your body and putting that body part into deep relaxation.
So start with your toes, ankles, shin, knee..etc.. and work your way up to your face, chin, nose ears and finally your eyes.
5) You should now be able to visualize all those lights in your body being turned off and relaxed..
6) Lastly visualize your spirit slowly sinking into your subconscious and that will eventually put you to sleep.
I've found this to be a very useful technique. Remember to focus, while you're trying to relax each and every body part, your mind might wander, and start to think about other things. Practice this a few times and you'll get better at it.
Cheers