I'm not always upbeat and engaged. Sometimes I get downright depressed. Usually it takes the form of some kind of existential thing, and I don't interiorize it; so it's not like a dangerous place for me to be. That doesn't make it any less of a downer.
But there's always your personal list of all possible alternatives wonking around. Just sometimes you'd like the luxury of a look-in from time to time, y'know?