I have noticed at night that I feel like I am "fluttering" inside. Not my heart as such, but my hands and legs. This is a weird feeing and not very nice. It's not a muscular thing, it seems to come more from inside. It feels like I am wobbling slightly, all over. The wobbling starts and then pauses, and then starts again. I know this is peculiar, but does anyone have any idea what it could be?!
Or it could be merely psychological, have you been stressed out and felt irritable/panicky lately? If so just take a day or two off and try to relax the best way you think possible.
I may sound like a broken record but the best way to be sure of what it is, is to go to your doctor.