Forming a habit is always one thing that would always decide what someone would be used to doing and what that person wouldn't be disposed to doing at any particular point in time. When it comes to listening to music or songs when sleeping, I was never used to doing it until I found myself in a situation where music was always playing and as I had to stay in such environment for a long period of time, my body and mind started adjusting to being able to sleep with music being played in the background. Now, I'm very much used to sleeping with music playing in the room background to the extent that I seem to fall asleep very much quickly when a song is being played than when the room is very quiet. Now, sometimes I do use my small smartphone to play music once I want to sleep.