The average age at time of evaluation was lower than that registered in the literature but similar to the Brazilian series. Domestic work and heavy occupations appear to be related to precocious perception of the symptoms by interference with daily functions. The socioeconomically higher classes seek medical care early. There was no relationship with exposure to toxic agents or trauma.

RESUMO -Um caso de síndrome de Kleine-Levin é descrito em menino de 14 anos. O diagnóstico foi baseado nos sintomas de hipersonolência, megafagia e hipersexualidade, havendo boa resposta ao uso de cabarmazepina. Kleine-Levin syndrome: a ease report.SUMMARY -A case of a 14 year-old boy suffering from Kleine-Levin syndrome is described. The diagnosis was made by symptoms which suggested this disorder: megaphagia, hipersomnia and hipersexuality. A brief review is made emphasizing the pathophysiology, diagnosis and treatment of this syndrome which is frequently misdiagnosed.