CASE 6.--I add here three autobiographical reports, which I have gathered from literature. The first originates with the famous anatomist and physiologist Karl Friedrich Burdach, who from his tenth to his thirtieth year had occasional attacks of moon walking, although he apparently "enjoyed the most perfect health." "I have during these periods," he himself relates, "undertaken actions which I had to recognize as mine, merely because they could have been carried out by no one else. Thus one day it was incomprehensible to me why I had on no shirt when I awoke, and it remained so in spite of my utmost efforts to recollect myself, until the shirt was found in another room rolled together under a press. In my twenty-ninth year I was awakened from a night wandering by the question, What did I want? and then the consciousness of the somnambulistic state passed over in part to the awaking. First I found the question strange, but since I thought the reason for it would become plain, I need not betray it. Immediately, however, as I began to waken, I asked myself in what that consisted and, now that the somnambulistic state was over, the answer must be due me." One cannot help finding this self revelation exceedingly interesting. The hiding of the shirt, although the affair is so incompletely reported, especially in its motivation, points unmistakably at least to exhibitionism. The second sleep walking appears much more difficult of explanation. In this Burdach sought plainly a definite goal, which seemed so clear and transparent to him that he could not at all understand why anyone should question him about it. If we consider that his first thought on waking was that he need not betray this purpose, that moreover there enters at once a repression and causes him completely to forget it, there remains then no other possibility than that we have to do with a strongly forbidden wish, which the conscious censor will not allow to pass. It is easy to conceive a sexual motivation in this second instance if we remember that in the first sleep walking something sexual surely took place.