Something I recently heard on reddit, and my wife and I have been trying, is to go through the alphabet, and for each letter think of 3 unrelated words. About half the time it quiets my mind enough to fall asleep. I usually give up if I make it all the way through, my wife has reported that sometimes she's had to go through it twice to fall asleep.

Another thing that'll often put me to sleep is listening to an audio book, but I stopped doing that when my phone USB-C port broke, I only have plug-in earbuds, my wireless headphones are big cans, not really suitable for falling asleep in.