Anyone else?

On the plus side it burns more calories than sitting still

Me!

I have something similar, where I suddenly start tapping my knees when I’m anxious or thinking about something. My psychiatrist said that it’s the hyperactive side of my ADHD where I have so much energy and simply can’t sit still.

Yeah, I had this happen a lot when I wad younger, though, today at age 28, it only sometimes occurs^^