Rudolf Steiner: "We will only come to know ourselves fully if we can say to ourselves at every moment of our life that we are not only a person of flesh and blood, with consciousness, as most people today are aware of, but also someone who hatches or emerges from his body between falling asleep and reawakening. And that during this time of sleep we live in quite different conditions than in ordinary waking life. Only then, during sleep, is our I in its own, true element ~ it can unfold and lay claim to its substantiality."