I do this thing a lot where I'll stare (not at anything in particular) while thinking or something. My mother does this a lot too. In a trance-like state. Visibly zoned out but still subtly aware of my environment. Usually the thinking accompanying it is in terms of small videos and concepts/ideas, rather than actual sentences. I've had people snap their fingers in front of my face because of this. What function could this be? Anyone else do this?