I also am menopausal. I have had this vibration feeling at night when going to sleep, off and on for about three weeks or so now. It happens mostly when I'm laying on my left side. Mostly I feel it in my torso, but sometimes in my legs too. The last couple of days I have felt it sitting in my chair during the day too, although not as pronounced. The feeling is like the kind of residual vibration one feels after operating strongly vibrating machinery. Like a powerful lawnmower or a motorbike. I would imagine that people operating jackhammers must get this sensation quite often.
I have no idea what causes it, but I have been able to control it with meridian therapy, also known as energy tapping, or EFT (Emotional Freedom Technique). I just do a couple of rounds of quick tapping on my acupuncture meridians and I am vibration free for the rest of the night. I also tap for insomnia and hot flashes when I need to. Less and less lately. This meridian tapping technique is very simple to learn and use and it works great. Anybody can learn it and there is a free manual online that tells you how. Just Google "Gary Craig" and "EFT" and the first site that comes up has the free manual - no strings attached. (Gary Craig is the founder of EFT.) That site also has scads of testimonials from people who use the technique for various conditions. Very, very interesting.
Hope this helps you all. It's definitely helping me. For the record: I am not affiliated with these people in any way other than my interest in their technique, which I am now studying so I can help others with it too.