It is possible to use sound as a sleep aid, although music may not be the best option. In a quiet room, the mind gets very alert and so intrusive sounds coming from outside the room like a car driving past, a neighbor slamming a door and so on will be perceived as relatively loud in a quiet environment. If you have some sort of background noise going on, that will help "dampen" intrusive sounds. The background sound itself won't be noticeable after a little while because the brain will become habituated and filter it out. The sound of a fan f.ex in a bedroom may actually help the room sound more peaceful.
This is the reason some businesses have started using white noise generators, for example in office landscapes. Instead of fans or white noise generators, one can use ambient nature sounds like waves crashing on a beach or the sound of a rainstorm perhaps. It's good to use the same sounds so you don't have to get used to (habituate yourself to) new ones all the time.
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