Similar to petercooper, I used podcasts and audiobooks to counter the chatter in my brain.

But Shengbo's suggestion is a great one because I also found ASMR videos even better. There are a variety of styles, but some are reading stories and in a very relaxing voice - so best of both worlds.

You can read more about how ASMR videos may cause your brain to relax and induce sleepiness here: http://asmruniversity.com/origin-theory-of-asmr/

I use meditation. Deliberately let the chatter drift away, watch it disappear into the void...asleep. 30 years of this, I can go to sleep in seconds.