I have a terrible time sleeping and staying asleep, but that seems to be mostly because my head plugs up when I lie down in bed. I am sleeping more and more in my recliner. And, yes, that is against my Doctors wishes.
Having said that...I do find the sound of rain on my TV to be soothing and relaxing. They have many to choose from on YouTube. They stay on for hours and many on a black screen.
I love all types of music but find that when I try to fall asleep to something, sooner or later there is a high note or something in the composition that is irritating to me and wakes me out of that half slumber.