Well, there are also the proper muscle twitches which feel like involuntary mini-jerks. Especially just as trying to fall asleep - which jerks you awake. Sometimes those would be physical muscle twitches and sometimes psychological startles (called hypnic jerks)...
All this stuff is quite common when you talk to other women going through menopause and is stuff doctors should be really familiar with, but they will look at you like you are from outer space and then try to tell you that you have some awful neurological disease. I'm 100% sure it's menopause, I've just found too many other women with exactly the same stuff..