No answer, but I wonder if it’s more than conditioning. At times when I’m thinking, with others or alone, I mash my hand to my chin/lower lip. I don’t feel I’m indicating anything, but I swear it helps with ideas.

Joke reference from a Tool song, Hooker with a Penis.

Anytime someone refers to '92 it’s mandatory

From the first EP?

Bad habit, your brain needs a lack of talking heads when you sleep.

If silence doesn’t work for you, try something with steady noise. Some use white noise generators, for me it’s the whir from an air purifier.