---

Background and Objective: Attention deficit and hyperactivity disorder (ADHD) is the most common neurodevelopmental disorder in childhood. 20-50% of ADHD affacted children have sleep disorders which can cause cognitive and behavioral disorders. This study was done to determine the sleep problems in children with ADHD. Method: In this case control study, 52 children with ADHD was considered as cases and 52 school age children without ADHD as a control group in Gorgan, northern Iran during 2013. Sleep habits (CSHQ) and DSM-IV questionnaires were filled for each child. Results: Sleep problems were observed in 45 (86.5%) and 36 (69.2%) of children in case and control group, respectively (P<0.05). The mean score of sleep problems in case and control group was 48.25±6.61 and 45.87±6.23, respectively (P<0.05). The score of resistance to sleep, anxious habits of sleep and waking during night in cases were more than controls (P<0.05). Conclusion: Sleep problems in children with ADHD are more frequent than children without ADHD.