Maybe it is your worries/stress/thoughts that are bothering you? Don't think about anything before going to sleep, really relax.
It is not good to play video games or watch TV or surf the Net before going to sleep. Rather take 15-30 minutes time-out and just relax, clear your mind and then go to sleep. Avoid coffeine during the day, and rather eat yourself full at least 2 or more hrs before you go to sleep, 'cause it's not good to eat right before going to sleep. Drink a lot of water. Sometimes to take some fresh air before going to sleep helps. Keep it quite. The ideal room to sleep in is sligthly cool..


If nothing helps and you are sure about it, go see a doctor. Seriously, it might be something else, Allah knows best, but checking is never a bad move. Also it is not preferable to use sleeping pills without consulating a doctor first so, inshaAllah, do go see a doctor ASAP.

Selam aleykum.