Artist: Burzum
Track: Rundtgåing av den Transcendentale Egenhetens Støtte
Album: Filosofem
Although many do not consider this a chilling night music, because of the black metal orientation of the band, it is a minimalistic ambient music. No vocals, no guitars, no drums. Only keyboards / fx.
I normally listen to it when I go to my sleep time and to be honest, I'm heavily asleep before the 15 minute mark.