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Because the collection of normative sleep data in the pediatric age group largely depends on technical issues, this article discusses various aspects of sleep recordings in infants and children. Polygraphic monitoring of sleep and waking behavior contributes to a better description of maturational stages in children, from the prenatal period to the end of adolescence. This article reviews the general characteristics of normal children's sleep and the environmental factors that influence these maturational processes. The use of polygraphic recordings to identify neurological deficits and to predict behavioral and neurological outcome in infants and children, however, does not hold great promise. The importance of polysomnographic evaluation is admitted for some major clinical conditions, such as risks for abnormal breathing or narcoleptic attacks.