This paper presents a brief summary of Freud's model of the mind in sleep and dreaming as presented in The Interpretation of Dreams (1900) and amended in his paper “A Metapsychological Supplement to the Theory of Dreams” (1917). The basic elements of the metapsychology are described including the functional role of the mind and the contributions from the different components of the mind, such as perception, memory, thought processes, and libidinal drives. The mechanisms employed to handle psychological stimuli by the sleeping mind are contrasted with those used by the awake mind. The primary and secondary processes are defined and illustrated. There is a description of Freud's model for the formation of dreams. A clinical example of a dream and its associations, including a second dream, are used to illustrate Freud's model.