As a kid, something similar happened to me sort of regularly (maybe a few times a year?). As I was falling asleep, some noises that initially might have been normal ambient noises started looping, acquiring some rhythmic pattern and becoming progressively louder, until suddenly there was a loud bang followed by a sense of complete void and silence.
After a while I learned to notice the "looping sound" pattern and just raise my head from the pillow to interrupt it. Then, at some point, it never returned again.
This also happens for me when I use psychedelics (like LSD). It's very fascinating when it happens. I'm autistic, maybe that has something to do with it.
After a while I learned to notice the "looping sound" pattern and just raise my head from the pillow to interrupt it. Then, at some point, it never returned again.