I might get blasted for posting this, (especially by Gonzo
), but have you considered Ambient Music Therapy? I tried this a few years back and it's really relaxing. I honestly don't know why I stopped, but I'm thinking about doing it again. IIRC, I had some really cool dreams!
Live365.com has a pretty good selection, but there are commercials. Meh. Here's a link to their Ambient stations...
http://www.live365.com/index.live. Cox Cable also has an On Demand station called, "Soundscapes". I would either fall asleep listening to that or one of my "Enigma" cd's.