My nightly ritual usually consists of at least an hour of music, but I always end up falling asleep in the middle of an album. Raw black metal usually keeps me awake, though, and often provides very vivid experiences. A long while ago, I listened to De Mysteriis Dom Sathanas in the middle of the night and, in my half-conscious awareness, thought I was demon-possessed.
Another interesting experience had me pitted against an enormous spider while listening to Gorgoroth's Antichrist. I couldn't get back to sleep for nearly half an hour because I feared of poison.
I'm such a wimp.