I catch myself "typing" all the time! Ever since computer class in high school I believe! I'm 28 now! Wondering if this is at all common. Lol. Not a huge deal as it doesn't interfere with anything in life. Just a semi-strange compulsion/nervous tick I guess? I definitely catch myself "typing" out words as they go through my head, as if I'm using a keyboard...I actually move my fingers. Sometimes I'm sort of unconsciously doing it and I catch myself, sometimes I'm totally aware. I'm even typing in my head now as I'm typing...if that makes sense. Lol. I don't do it ALL the time....but I definitely do it a lot. Like I said sometimes I don't even realize I am doing it!!
I find myself doing this quite often. It can get somewhat annoying, but I guess it can help us type faster . The same thing happens with playing the piano... I "play the piano" whenever I happen to be listening to classical music, or am replaying some classical music in my head. I wonder if this is common.
I do it also. Just not very often anymore. I notice it happening after I have had to write a big report or a long letter. During one job I had it happened quite often. I was responsible for typing dictated messages. After doing that for eight hours a day, I was even dreaming about typing. I never really bothered to notice if my fingers were actually moving. I just know that every word I would see written I would imagine typing in my head.