It is my purpose to bring also our beautiful literature to the solution of the exceedingly difficult and obscure problem of sleep walking and moon walking. Our poets, for all our psychiatrists and psychologists, possess the finest knowledge of the psyche and during the centuries before science was able to throw light upon the puzzles of the mind, they solved them prophetically with discerning spirit. Thus they knew how to bring to light various elements of our problem. Their creations directed to that end arose from their own inner nature, through analogy, or because sleep walking was not foreign to them themselves. And even if neither were the case, they still had the ability of those who have a real true knowledge of men, quite intuitively to see clearly into the unconscious of others. We will come to know what profound interest many of the great poets, like Otto Ludwig and Heinrich von Kleist took in night wandering and moon walking and how they have first introduced these dark problems into other traditional material. A striking similarity is revealed if one compares that which the poet has in mind with that which I have been able to report in the medical section. I shall be able satisfactorily to verify the statement that science and art have reached exactly the same result. First however I will present the examples from the poets according to their comprehensibility and their transparency. I begin with "AEBELÖ," by Sophus Michaelis. Twice had Soelver drawn near to the maiden Gro, daughter of his neighbor, Sten Basse. The first time was when in the spring he visited the island Aebeloe, which belonged to him but was quite uninhabited. So bright the day and so warm the kiss of the sun upon him, yet suddenly it was "as if his bare neck were flooded by a still warmer wave of light." A maiden stood before him, "who was like pure light. The eyes were as if without pupils, without a glance; as she looked it was as if white clouds floated forth out of a heavenly blue background. Soelver sprang up and stood face to face before her. Her cheeks grew red. Although unknown to each other, they smiled one at the other like two seraphim. Her hands opened toward his and before her, as out of her lap, fell the flowers which she had gathered. Soelver believed for a moment that it was all a dream. He swung his hands into the air and a hand waved toward him. He closed his eyes that he might enjoy to the full the soft, fleeting impression. It floated over his hand like an incorporeal breath. Was it then a ghostly vision, that wandered there at his side!" When however he knew that the maiden near him was a living being, then "his lips sank toward her trembling with desire, unintentionally and yet irrevocably." At this moment a "cloud passed over the sun and the light became at once dulled as if a mist had fallen upon all the flowers. Of all this he did not become so quickly aware, as that his own cheeks