I. Soul and Spirit in the Human Physical Constitution

The condition of sleep, too, can be understood only if we go much more closely into these matters. During sleep it is only the physical body and the etheric body that remain as they are during the waking state; the Ego and the astral body are outside. But in the sleeping human being the forces that are within the physical and etheric bodies are then also active on the airy organism and the warmth organism as well.