Purpose: To test the effects of a single-session parent sleep educational intervention, led by a pediatric nurse, on sleep in a group of school-aged children attending a National Health Service mental health clinic in Murcia, Spain. Design and Methods: Parents/caregivers of 26 children (mean age = 8.58 years; standard deviation = 0.58; 80.8% male) with neurodevelopmental or mental health disorders (84.6% pervasive developmental disorder), and with a suspicion of a behavioral sleep problem, participated in a 45-min group educational session about healt