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Normal Sleep, Sleep Physiology, and Sleep Deprivation: eMedicine Neurology
Normal Sleep in Adults, Infants, and the Elderly Normal sleep is divided into non–rapid eye movement (NREM) and rapid eye movement (REM) sleep. NREM sleep is further divided into progressively deeper stages of sleep: stage N1, stage N2, and stage N3 (deep or delta-wave sleep). As NREM stages progress, stronger stimuli are required to result [...]