OK, I agree with reciting Surahs of course, but sometimes it could be we are not physically comfortable, so we don't feel relaxed enough to fall asleep? It's like that with me. So as crazy as it sounds, I made a sleep aid (cushion/pillow) which is about five feet long and it helps support restless arms and legs and also stops me from turning on my front. It might sound sad, but it's helped so much, I can't imagine being without it now. 
mg:
So, yeh, extra pillows, meaning being mre comfortable physically might be what you need.
mg:So, yeh, extra pillows, meaning being mre comfortable physically might be what you need.