automatic pilot

(noun) a cognitive state in which you act without self-awareness. Synonyms: automatic pilot, autopilot. Examples: "She went about her chores on automatic pilot." "Too much of the writing seems to have been done on automatic pilot." "She talked and he dozed and my mind went on autopilot."

(noun) a navigational device that automatically keeps ships or planes or spacecraft on a steady course. Synonyms: autopilot, automatic pilot, robot pilot.