I listen to music at home and in the car. I don't have a discman yet. In the car I listen to anything on the radio I can stand. At home, I listen to music I love, but I don't listen to music if I need to concentrate to finish my homework or am working on something that needs a lot of attention.
As for sleeping, I am now listening to Down or David Gray before going to sleep...
I listen to music that fits my emotions. I can totally immerse myself in the music of my favourite bands...