This report summarizes the presentations and discussion at a work- shop entitled Sleep Needs, Patterns, and Difficulties of Adolescents, held on September 22, 1999. The workshop was organized by the Board on Children, Youth, and Families and the Forum on Adolescence of the Na- tional Research Council and Institute of Medicine, with funding from the Carnegie Corporation of New York and the National Institute on Child Health and Human Development, . Department of Health and Hu- man Services.