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Objectives: The aim of this study is to assess the efficacy and side effects of melatonin use in a population of children with neurodevelopmental disabilities who had sleep disorders. Methods: This is a cross-sectional study conducted in the pediatric neurology clinic at King Abdulaziz Medical City. A designed questionnaire was given to the parents to inquire about the sleep characteristics of their children before and after using melatonin. The patients' demographic data were collected and different parameters before and after starting melatonin were compared. Categorical variables were summarized and reported in terms of frequency and percent (n%). Continuous variables were reported in terms of mean and standard deviation. Results: A total of 23 patients were enrolled in our study, of which 15 (65.22%) were male. The mean age was 5.83 ± 3.07 years. For melatonin dose, 9 (39.13%) received 1 mg, 8 (34.78%) received 2 mg, and 6 (26.09%) received over 3 mg. Regarding melatonin duration of use, 7 (30.43%) received melatonin for 0 to 6 months, 7 (30.43%) received it for 7 to 12 months, and 9 (39.13%) received it for over a year. Significant differences were observed in time taken to fall asleep (P =0.046), the number of times the child woke up at night (P =0.071), total sleep time within 24 hours (P =.011), and time taken to wake up (P =.007), while no significant difference was observed in the number of naps taken during the daytime (P =.801). There were no major side effects reported. Conclusion: Melatonin had a significant impact on total sleep time and quality during the pre and post assessment of children with neurodevelopmental disabilities and sleep disorders. [ABSTRACT FROM AUTHOR]