I did find another, more general, Steiner-said
about the dangers of "dimming of consciousness":
"In the present age, Ahriman can only have a strong influence upon men when their consciousness is diverted in one way or another. The most radical phenomenon is that of a fainting fit, or a diminution of consciousness lasting for a considerable time. In times like this, when a man is overcome by faintness or diminution of consciousness, the Ahriman forces can most effectively approach him. At such times they work their way into him, he is exposed to them."
Esoteric Studies III
By Rudolf Steiner
Dornach, August 3rd, 1924