[edited by] Meir Kryger, MD, FRCPC, Professor, Pulmonary, Critical Care, and Sleep Medicine, New Haven, Connecticut, Thomas Roth, PhD, Division Head, Sleep Disorders and Research Center, Henry Ford Hospital, Detroit, Michigan, William C. Dement, MD, PhD, Lowell W. and Josephine Q. Berry Professor of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Sleep Sciences and Medicine, Stanford, California.