"Nothing."

"Are you sure of that?"

"Well, nothing of real account, at all events. I have been told that somebody jokingly said to her that if she were not a good girl a black man would come to her room and carry her off. But this did not seem to disturb her much at the time."

Hereupon, the situation became clear to the physician. It was evident that, subconsciously if not consciously, the thought of the supposed danger, acting on a mind none too well organised by inheritance—there was epilepsy in the family—had acquired sufficient force to bring on the attack of nocturnal panic and the subsequent attacks of day and night terrors. Probably, moreover, this was not the first time that statements of a fear-inspiring character had been made to the child, so that this last "joke" might well serve to agitate her excessively.

Compare with this the case of a four-year-old boy, whose night terrors were accompanied by a strange hallucination that he saw the devil, and that the devil was trying to catch him. Every night for several weeks he would wake after one or two hours of sleep, would leap from bed with a shriek, and run wildly around the room, calling on his mother to save him and to drive the devil out of the house.

Impressed by the recurrence of this hallucination, the physician in charge of the case questioned the boy's mother as to a possible explanation for his believing the devil was chasing him. Reluctantly, the mother confessed that one day when her little son had been unruly she had warned him that if he did not behave the devil would come for him. It was the night after she had thus foolishly threatened him that he had his first attack of pavor nocturnus. Armed with this knowledge, the physician began a course of treatment which effected a cure in a week. It properly included tonics and dieting to overcome the indigestion and other physical ailments caused by the strain of nervous excitement. But its principal feature was treatment by suggestion, to dislodge from the boy's mind his morbid fear of the devil.

Anything which causes the instinct of fear to function abnormally may act with decisive force in bringing on night terrors. The telling of ghost stories and other gruesome tales of the supernatural has been productive of much harm in this respect. And, as brought out in the preceding chapter, cases of night terrors have similarly been traced to the hearing or reading by children of fairy tales containing elements of the horrible. The child that is supersensitive may be so impressed by these elements as to brood over them and, in waking reverie, apply them to himself. Thus they get fixed in the mind, to disturb and alarm it, and, eventually, to find expression in dreams of so unpleasant a character that night terrors may be a result.

With the night terrors left untreated psychologically, subsequent nervous ailments, perhaps lifelong invalidism, may further penalise the hapless victim of parental thoughtlessness. I am reminded of a certain patient of Doctor Sidis's, a woman afflicted with neurotic ills up to the age of sixty, and, when she first consulted the New England specialist, displaying a most complicated set of disease symptoms. She had kidney trouble, stomach trouble, frequent headaches, insomnia, and general nervousness. In especial, she suffered from an obsessive fear of becoming insane. This fear, at times, was so extreme that she would walk up and down her room night after night, "like an animal in a cage," to use Doctor Sidis's expressive phrase. Repeated examinations by different physicians had failed to bring to light any evidences of organic disease of stomach, kidneys, or brain, and a diagnosis of hysteria had finally been made. Consequently, it became Doctor Sidis's special task to endeavour to get at these latent memory-images that had acted with disintegrative power on the mental and bodily processes, recall them to conscious remembrance, and, by suggestive treatment, rob them of their disease-producing potency.

Step by step, by a method of psychological analysis of his own invention, he took his patient back through her life history. He found that, in middle life, she had had several distressing experiences, but none of them adequate to account for her hysteria. Always, there remained an obscure element which did not become clearly outlined until, in the course of the analysis, childhood memories began to emerge. Then it appeared that there had been a period of night terrors, the source of which was definitely traced to a shock experienced at the age of five. At that age, through some mischance, the patient had been allowed to spend some time with an insane woman who was in a maniacal state.

Of a sensitive nervous organisation to begin with, she was overwhelmed by this experience. She could not get the image of the insane woman out of her mind, and the fearful thought kept coming again and again to her, "Do little girls ever go insane?" Then followed the night terrors, to be "outgrown" in due course. But the analysis revealed that, though the memory of her experience with the insane woman had gradually faded from conscious recollection, it had never been subconsciously forgotten. Even now, fifty-five years later, she still saw this woman in her dreams. It was the baneful influence of this shock that had given rise to her obsessive fear of insanity and had prepared the ground for the condition of abnormal suggestibility making possible the hysterical imitation of organic kidney and stomach disease. As was proved by the outcome of Doctor Sidis's psychotherapeutic treatment.