Gosh, how awful. Good on you for being the considerate neighbor, though.

What about experimenting with moving your bed to different parts of the bedroom where it could possibly absorb less vibrations? And also earplugs can reduce the amount of sound entering your ears without having to use your headphones. I used to use earplugs to help me sleep and they were great. All I could hear was the sound of my own breath. But I didn't have the rumbling issue which you do.