Fear and Control
Have you ever experienced grabbing some snacks without any cravings? And not understanding why you "had to" do it? Could it be that the impulse comes from your subconscious mind and not your body? Have you ever experienced that after a period of successfully doing various tasks or smoothly fulfiling objectives, when finally "all things seemed to be under beautiful control", you all of a sudden get the unexplained feeling that "very soon something will go wrong"?
(And that very often it did?)