“A man of sound and disciplined character, before he goes to sleep, has wakened his reason and given it its fill of intellectual argument and inquiry; his desires he has neither starved nor indulged, so that they sink to rest and don't plague the highest part of him with their joys and sorrows, but leave it to pursue its investigations unhampered and on its own, and to its endeavors to apprehend things still unknown to it, whether past, present or future; the third, spirited, part of him he calms and keeps from quarrels so that he sleeps with an untroubled temper. Thus he goes to rest with the other parts of him quietened, and his reasoning element stimulated, and is in a state to grasp the truth undisturbed by lawless dreams and visions.”

—Socrates