My hands are ALWAYS moving. I hate it when it's pointed out, because there isn't much I can do about it really-half the time I don't even know I'm doing it, lol.
It varies for me... from wringing both of my wrists (grabbing with the opposite hand and twisting around them sort of, while wiggling my wrists around quite a bit), twirling my fingers, typing in the air, and just plain hand flapping.
The more aware of it I get, the more I try to stop... and the more I try to stop, the worse it gets because it gets extremely uncomfortable. It's like they just HAVE to move that way.
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Sorry about the incredibly long post...
"I enjoyed the meetings, too. It was like having friends." -Luna Lovegood