I used to have opera tickets and often fell asleep. It was an expensive nap, but a very good one. Listening to music during a nap can be marvelous.
After you've checked your health, you might question what you do all day before you listen to music. I'm home all day and listen to music while I work and also in the afternoon. I hardly ever listen past 4 or 5. I've gotten too tired and know my mind isn't up to music. If I get a jolt of energy at night, I might do an hour or so more work listening to music.
However, I would not say that falling asleep while listening to music is the worst thing. I think you get a very restful sleep that way.

