Try listening to a non-exciting podcast, played at 75% speed. It works for me. Lex Fridman's voice/tempo is perfect. The Overcast app can be set to turn off after N minutes.
Why We Sleep by Matthew Walker audiobook makes me fall asleep by chapter 2.
Meditation audio can also work, but for me, the gaps of silence are too long, and my brain starts churning/processing. (I know the point of meditation is to overcome this.)