if you don't already know, Robert Rich makes awesome soundscapes that are fun to fall asleep to. they're ambient, not distracting. check out his albums Drones and Trances. in fact i love all of his albums, but those are like 30 mins per song. he's even mentioned in Stephen Laberge's book on Lucid Dreaming. i once WILDed on accident listening to such music.

also Alio Die makes some unbelieveably good ambient. one of his songs 'password for entheogenic experience' is an hour long. it is not just a mundane loop. the sound of a distant bird call comes thru the dense atmosphere sometimes. his album 'sit tibi terra levis introspective' is also really good.

my favorite ambient:

Aidan Baker
Alio Die
Biosphere
Brian Eno
Echoes of Nature
Gas
Oophoi
Pan American
Robert Rich
Vidna Obmana

some of these are rare and underground collections, but are worth looking for. Some are more melodic, some more natural, some very abstract.

anyone else have recommendations for ambient?