7. How Do We Understand Illness and Death?

When a person sleeps, the physical body and the etheric body lie in bed. The astral body with the ego has stepped out. What does this astral body do at night? If we look at this, it sheds light on the nature of the entire human activity in the world. The spiritual scientist knows that the astral body, if it remains within the physical body, could never remove that which finds its expression in fatigue. Call it an accumulation of fatigue substances or something else, it is there and must be removed. Where does the fatigue come from? How is it removed?