As far as my observations go, it seems to me that there is a special disposition to sleep walking in the descendants of alcoholics and epileptics, of individuals with a distinctively sadistic character, finally of hysterics, whose motor activity is strongly affected, who also suffer with convulsions, tremor, paralyses or contractures. It should be merely briefly mentioned that the heightened motor excitability also establishes a disposition to a special muscle erotic, which in fact was easily demonstrable in every one of the cases of sleep walking and moon walking which have become known to me. The disturbance of the night's rest was made desirable through the satisfaction of the muscle erotic to every one for whom the excessive muscular activity offered an entirely specialized pleasure, even sexual enjoyment. Moreover in our case a series of features besides those already mentioned bear undoubted testimony to the abnormally increased muscle erotic. I have already elsewhere discussed them in detail[12] and will here merely name briefly the chief factors. The patient had an epileptic alcoholic grandfather on the mother's side, who was notorious when under the influence of alcohol for his cruelty and pleasure in whipping. She had, besides a strongly sadistic mother, two older brothers, of whom the elder was frightfully violent and brutal, often choking his brothers and sisters, while the other found an actually diabolical pleasure in destroying and demolishing everything. Our patient exhibited already at two years old as well as through her whole life a pleasure in striking blows, and also conversely a special pleasure in receiving them, further at four years old an intensive delight in dancing, an enjoyment that was unmistakably sexual. We have learned above how she delighted to press herself upon her mother's body or twine herself about her legs. Moreover, finally, one of her very earliest hysterical symptoms was a paralysis of the arm. [12] Cf. note 6, p. 163.