Recommended by Michael C
Sleep Tones by Six Organs Of Admittance consists of four 20 minute ambient soundscapes designed to "do nothing and go nowhere" and assist with insomia. These pieces are immersive and endless. Must have for any ambient collection. The artist includes some background to the release on the bandcamp page, so definitely check that out. Also, if you haven't already go and dig through Six Organs and Hermit Hut Records discography.