When I was a toddler my grandmother gave me my first blankie. Since then I have developed the habit of rubbing the edges of the blankie between my fingers. I tried to understand why this was happening, focusing more on how it makes me feel comfortable.
Along with that, there's an accompanying habit that I can only describe as sucking my tongue. Its like sucking a pacifier without a pacifier. The thing is, I never liked pacifiers.
Can you come up with a theory that explains the individual habits and their connections to each other? I find this an interesting thing that seems more under the radar than other things like AB/DL.