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Good in Very Good jacket. The text begins with a review of sleep phenomenology in man. Two separate types of sleep exist. Their differentiation is based on the electroencephalogram, the electromyogram of chin muscles, and eye movements. The complex nomenclature for these two sleep states and their various substages is reviewed. Mental activity which accompanies sleep, how this activity differs between the two sleep states and how it relates to psychoanalytic dream theory is examined. Neurochemical and neurophysiologic studies in the experimental animal are set forth, and the author's work which demonstrates that sleep states in chimpanzee are homologous to sleep states in man is reviewed. Results of sleep deprivation are discussed. The last of the basic science chapters examines how the sleeper processes information and how he awakens. The concept of sleep depth is shown to be of little scientific value.