Just a suggestion. Have you considered trying hearing protection to create a “low noise” bubble?

I have a pair of shotgun hearing protection ear muffs next to my bed. I only use them for emergencies when I really need to sleep and neighbors are partying very late. However, putting them on cuts any noise to a mumbling like in the distance.

Not the exact model or make but similar. Not electronic.

https://www.dickssportinggoods.com/p/walkers-game-ear-pro-fo...