Narcolepsy is a syndrome characterized by abnormality in the regulation of the sleep-wake cycle. It is a chronic disease commonly diagnosed between the ages of 40 and 60. However, the first symptoms often appear in childhood and/or adolescence. It is accepted that pediatric cases of narcolepsy generally remain unrecognized and undiagnosed. Clinical heterogeneity, especially in childhood, and development of symptoms over time contribute to the delay in diagnosis and treatment. The clinical symptoms and polysomnographic findings of five cases of pediatric narcolepsy are presented in this case report. (Archives of Neuropsychiatry 2011; 48: 158-61)