The sweet sweet, soothing voice of Robert Stack on "Unsolved Mysteries". I've seen damn near every episode, so it's become like a "comfort food"... puts me to sleep almost everytime

Futurama has been my go-to for years at this point.

This is exactly a trick of mine. It has to be already listened to, so that it’s a more passive listening experience.

Sometimes it also helps if the content of the audio does not clue me in to how far through the video I am. That’s just one less “I’m not falling asleep fast enough” indicator to keep me awake longer.

I just let old Drawfee episodes play on low volume while I sleep. Multiple familiar voices seems to be more effective to me.

I use one of those sleep masks with the built-in earphones to listen to different kinds of music and/or rain and thunder. Oddly I tend to like creepy and scary music or ambiance.

I've taken to listening to the Cobalt Core soundtrack, I never remember getting very far so I guess it works.