This study compares sleep disturbances in Thai children aged 5-12 years with attention-deficit hyperactivity disorder (ADHD) and typically developing children using the Children’s Sleep Habits Questionnaire (CSHQ)-Thai version. Fifty-five children with ADHD and 110 typically developing children were enrolled. Their parents completed the CSHQ, the ADHD rating scales, and the Strengths and Difficulties Questionnaire (SDQ). Children with ADHD had significantly higher scores in all subscales of the CSHQ compared to controls. Among children with ADHD, children with higher SDQ scores (> 15) appeared to have more sleep disturbances than those with relatively lower SDQ scores. Moreover, fewer sleep-related behavioral problems were observed in the medication treated group, which is particularly new to the field and for some perhaps not unexpected clinically.