I listen to music on my iPod while falling asleep often. I sleep with the music playing in my ears while asleep too. The cool thing about it is that sometimes the music is playing in my dream. One time I fell asleep listening to Radiohead, and then I had a dream that I was at a Radiohead concert. I listen to a lot of different and non-mainstream music, and when it comes on in my dreams, I think it's on the radio or something, and I'm like "OMG they're playing *blank* on the radio?!?!".

It's kind of like a movie with music in the background, but you're in the movie, and the music is playing to what you're doing.