I am a 66 year old male and started experiencing this vibrating phenomena about 3 months ago, usually in that semi-conscious state before waking up fully. It never feels life threatening but did cause me to think I was experiencing some sort of pre-Parkinsons symptom that I hadn't heard of before. This morning I experienced something new in the the intensity of the peaks (I estimate about 5 to 10 hertz). At the peaks of the cycles I also experienced auditory artifacts, like a speaker distorting... like a crackling. I'm glad to see that I'm not alone in experiencing this phenomenon. Interesting that all this thread started in 2022 after the roll out of the COVID vaccines. It would be interesting to collate all data and do some further research. I understand that correlation is not causation but it would be interesting to know if this experience has been reported in the medical community in the past, and if so under what set of circumstances. Just another mystery to be solved.