I turn on some beautiful music and if I'm very tired or drunk, I fall asleep right away. If not, I do the same thing as you. I can think sometimes for hours, and then suddenly look at the clock and wonder how the hell it is four in the morning and I'm still up. It sucks sometimes.
I'm so envious of you guys who are able to fall asleep to music. I just can't - I need silence. I imagine it would be super relaxing to do it.I turn on music most nights when I sleep alone while working on the road. When I'm at home I usually don't, but some nights I have to grab my iPhone and put my earbuds in if I'm really having trouble.
It can be anything too, not necessarily just relaxing music. I'm the kind of person who has to listen to the song or type of music they are feeling right at that moment, so even if it is metal I will put it on, otherwise I just lay there annoyed that I'm not listening to what I want to hear.