In my own case, dancing seems to be just a different form of autistic stimming or ADHD restlessness. I can't easily stand still; my leg starts bouncing. My arm wants to move. There is an inner repetitive movement. So instead of standing there in some public place looking like a nutcase because of classic autistic movements, I rather just end up looking like someone who is moving to sounds from an iPod. Except there is no iPod.
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When I must wait in a queue, I dance. Classified as an aspie with ADHD on 31 March 2009 at the age of 43.