Tehran University of Medical Sciences Iranian Journal of Psychiatry 1735-4587 2 3 2007 09 15 127 128 Pezhman Ghaem-Maghamy Department of Psychiatry, Iran University of Medical Sciences, Mental Health Research Center, Tehran, Iran Mirfarhad Ghalebandi Department of Psychiatry, Iran University of Medical Sciences, Mental Health Research Center, Tehran, Iran Mitra Hakim shooshtary Department of Psychiatry, Iran University of Medical Sciences, Mental Health Research Center, Tehran, Iran 2015 10 17 Kleine-levin syndrome is characterized as a periodic hypersomnia crisis as well as dietary and variable significant psychic symptoms. This report describes the finding on an evaluation of a 15- year- old girl with KLS. She had amnesia to her episodes. All episodes were correlated with menstrual period.Polysomnographic finding of this patient was normal with 5 sleep cycles in sleep architecture and sleep efficiency of 99%. Decreasing in stage I, increasing of stage III and IV and decreasing in REM sleep was notable. Dextroamphetamin was given to the patient in order to decrease sleepiness.Kleine-levin syndrome should be considered in patients with periodic hypersomnia. https://ijps.tums.ac.ir/index.php/ijps/article/view/451 https://ijps.tums.ac.ir/index.php/ijps/article/download/451/445