I literally never turn off my television. I have an Xbox One S that I've owned for nearly eight or so years now, and I constantly have it on YouTube playing something in the background—usually some kind of ambience. I have gotten so used to it that it's strange not having any sounds around me. That is also why I have a fan on 24/7 in my room.
I've done this since I was a kid because I used to be really scared of the dark. I had a habit of watching Slenderman and other indie horror game playthroughs and they terrified me so much so that I would always have something playing in the background just so that I could fall asleep. Of course, as I grew older, I actually came to cherish the dark more than anything, but I still had the habit of drifting off to sleep while something was playing in the background. I'm fully capable of sleeping without it, but it's still nice to have.