A systematic review recently published in the Journal of Attention Disorders examined the presence and impact of sleep disturbances in children with attention-deficit/hyperactivity disorder (ADHD). Below, lead author Upasana Bondopadhyay, MPhil, and co-author Andrew Coogan, PhD, from the University of Ireland, Maynooth, explain how the study was designed, their most significant findings, and a surprising gap in existing research that they found.