Maybe finds a few you like and make a playlist, then just watch those specific ones? Something that you can mentally focus on when in bed with your eyes closed, but also something that’s not competing to hold your visual attention as well as no giant volume swings for your audio attention. Don’t want to fall asleep to quiet dialog only to be woken by the shootout in the next scene, or fall asleep to a mellow ballad and awoken by a rock track, for example.

Edited to add: around getting bored with it— I have changed what I listen or watch every few years, but it’s a very slow ramp up of new and ramp down of old. Something your brain recognizes and likes, but isn’t trying to stay awake to read the next page or see the next episode or upcoming challenge or whatever.