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In this monograph Dr. Sadger has attempted to discover the cause and meaning of these phenomena of sleep: the motor responses to dreams. He uses as sources for his conclusions one exhaustively analyzed case, one case in which the sleep walking element was a minor one, three cases quite briefly described, and three autobiographic accounts. This, the clinical part of the book, occupies the first forty-four pages; part 2,.almost 100 pages, with the exception of a couple of pages of résumé and conclusions, is taken up with an analysis of episodes of sleep walking found in the literature of fiction and drama. In the clinical part there are long quotations from conversations between the patient and the doctor tending to show the causal relation between infantile sexual memories and sleep walking. There is also evidence adduced showing the relation of the moon to the light borne by the parent visiting