Lecture IX

The general assertion that sleep is healthful is correct in a certain sense, but only under certain conditions. And it must not prevent us from examining the true situation without prejudice. Physical processes in the human physical body can only be healthful when the ego and astral organization are down in the physical body, as is the normal condition during waking life. It is constantly interrupted by the sleep condition. Normally, however, even during sleep the catabolic process is still always going on in the physical body; it must be there so that the soul-life and spiritual life as a whole can really unfold. For the spiritual life is not connected with anabolic processes, only with catabolic processes. During sleep, therefore, there must be just as much of the catabolic processes as a person needs for waking life to unfold the next morning. If too many catabolic processes are there because of some unhealthy sleep condition, a residue of these processes piles up in the human organism, and then we have the inner cause for an illness.