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The function of the dream, whatever its content and hidden meaning, is to protect and maintain sleep. This Freudian discovery coexists alongside the interpretative vision that, at the beginning of the development of Freud’s thought, makes the dream the hallucinatory fulfillment of an unconscious desire. Michel Fain’s major contribution concerning the place of the dream in the psychic economy led us to suppose that the dream also has the mission of trying to represent the body, by transforming, throughout sleep, bodily sensoriality into psychic representation.