Note 211 — Chapter IX

Dr. Marie de Manacéïne, who has studied the phenomena of the hypnagogic state experimentally in much detail (Sleep, pp. 195-220), finds that in its deepest stage it is marked by echolalia, or the tendency to repeat automatically what is said, and in a less deep stage by abnormal suggestibility or the tendency to accept ideas and especially emotions. She considers that the hypnagogic state becomes abnormal when it lasts for more than fifteen seconds. It may last for more than six minutes, and is then of serious import. She shows reason to believe that the hypnagogic state is substantially identical with the hypnotic state, and she regards it as probably due to cerebral anaemia. She finds it especially marked in children under fifteen, the more so if they belong to the working-class, and rather common among adolescent girls and young women, especially if anaemic, but among adults rarer in women than in men, becoming more frequent in both sexes with old age; the phlegmatic are more liable to it than the sanguine or the nervous.