Parental Insanity

I can't stop bouncing my leg. I bounce Matty on my knee when he's a little fussy. He really seems to enjoy it. My problem stems from when I am not holding Matty and he starts to fuss. I start bouncing my leg. I don't do it consciously. For example, I'll be eating dinner when he starts to cry. I'll look down and there's my leg bouncing away. Is there such a thing as parental insanity? Maybe I need to look this up...