My number one sleep aid is this 8 album set called Healing Therapy Music. Each one is named for its overall atmosphere.
Healing Therapy Music
If you listen and like it let me know I can find a dl link and send it your way. I cant seem to find who recorded all of it but it is without a doubt the most relaxing group of music I have ever played. Many a nights have I fallen asleep to all 8 albums.