Sleep & Fatigue
To be filled for a time with the impressions of the outer world arouses in the soul the craving to go over from this into another state, in which the soul is surrendered to the processes other own bodily nature. There is this alternation: the state of being given up to the impressions of the outer world, and that of being given up to one’s own body. During the former state, the craving for the latter is unconsciously engendered, and this in turn then takes its course entirely in the unconscious. It is the longing to be devoted to one’s own bodily nature which manifests as fatigue. In truth we ought rather to say that we feel tired because we want to fall asleep, not that we want to fall asleep because we feel tired.
— Rudolf Steiner