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Kleine-Levin syndrome (KLS) is a rare disease, which progresses with episodes of hypersomnia, along with hyperphagia, hypersexuality, and cognitive impairment. The incidence of this disease is 1-5 per million individuals. Since it is a rare and often mistaken for other psychiatric disorders, it is important not to skip the patients who apply to child psychiatry with complaints of KLS-like symptoms. It is intended to emphasize the importance of multidisciplinary study with this patient whose process of diagnosis delayed. A fourteen-year-old male patient applied to our clinic with the complaints of oversleeping, overeating, hypersexuality and decrease in speech. He used to sleep about 16-18 hours of a day. This was happening from time to time, when he was asleep. These episodes lead to a week and continuing over in the recent year as a few times a in a month. During these episodes irritability, overeating was going on at awake state. These periods were going on about a week and, they have been getting back to normal completely for two weeks and then the episodes were coming back again. These complaints started six months ago. He had been threatening with other different diagnosis except KLS, however his complaints went on. The neurology consultation was asked for. Borderline mental retardation and ADHD were considered as comorbid. The results of Polysomnography and Electroencephalography (EEG) were normal. The patient was assessed with neurology clinic and diagnosed as KLS. The treatment was started with Carbamazepine and methylphenidate. The reduction was observed in frequency and severity of episodes during follow up treatments. In order to diagnose of KLS, which is entirely clinical and similar to several other conditions like narcolepsy, bipolar disorder, it is needed to eliminate several other conditions. Because of the similarity with other symptoms, KLS disease can be mistaken for different psychiatric disorders. Our case had been also followed up with depression, sinusitis diagnosis from other clinics. KLS was diagnosed by assessing of patient with the neurology clinic and the treatment was started immediately. The patient has benefited from this treatment. In conclusion, this disease has ambiguous symptoms, which is hard to diagnose, require multidisciplinary approach.