en Aim: Pediatric sleep problems can result in negative consequences for both mothers and children. Considering the relatively high prevalence of sleep disorders among children with ADHD (Attention Deficit/Hyperactivity Disorder), this study was designed to investigate the impact of a sleep hygiene intervention to promote sleep problems in children with ADHD and maternal mental health.<br />Methods: This randomized controlled trial was conducted on 62 children aged 7-13 years with the diagnosis of ADHD and comorbid sleep disorders accompanied by their mothers. Children's Sleep Habits Questionnaire (CSHQ) and Depression, Anxiety and Stress Scale (DASS) were completed by the children's mothers, and then the participants were allocated randomly into experimental and control groups. Mothers of the children in the experimental group received a sleep hygiene educational intervention, which was delivered through a training session and a booklet followed by two telephone calls and educational text messages. Participants in the control group received usual clinical care. The post-test was performed two months after intervention.<br />Findings: 56 participants (experimental group: n=28, control group: n=28) completed the survey. Data analysis showed that, compared with the control group, the experimental group had a significant reduction in mean scores of CSHQ (P=0.001) and stress subscale scores (F= 0.106, P= 0/015), after controlling pre-test. Besides, the mothers' stress was correlated with the children's CSHQ overall scores (r= 0.52, P= 0.001).<br />Conclusion: Implementing a sleep hygiene intervention in a sample of children with ADHD could result in improved children sleep problems and maternal well-being. Attention deficit-hyperactivity disorder (ADHD),Child,Inadequate sleep hygiene,Maternal health,Sleep 63 74 http://hehp.daneshafarand.org/browse.php?a_code=A-5-12233-2&slc_lang=en&sid=4 Hedieh Shahhatami Hedieh Shahhatami 100319475328460068101 100319475328460068101 No M.Sc., Department of Health Education and Health Promotion, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran M.Sc., Department of Health Education and Health Promotion, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran Farkhondeh Amin Shokravi Farkhondeh Amin Shokravi 100319475328460068100 100319475328460068100 Yes Associate Professor, Department of Health Education and Health Promotion, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran Associate Professor, Department of Health Education and Health Promotion, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran Mitra Hakim Shooshtari Mitra Hakim Shooshtari 100319475328460068099 100319475328460068099 No MD, Department of Psychiatry, School of Mental Health research, Iran University of Medical Sciences, Tehran, Iran MD, Department of Psychiatry, School of Mental Health research, Iran University of Medical Sciences, Tehran, Iran