The Nature of Eternity

This confirms what Spiritual Science has to say—that in sleep a man goes out with his soul from the physical body, leaving behind the bearer of memories, the vesture upon which he is working throughout his life, so that his memory-pictures can be preserved. In sleep he is outside the physical body, and also that external vesture of the soul, called in Spiritual Science the etheric body, which in ordinary sleep remains bound to the physical body. At the moment of death, however, this etheric body, which is also the activator of life, leaves the physical body, and only this outer physical shell of the human being remains. Death indeed comes because the etheric body, though present in ordinary sleep, is no longer there.