Sleep problems in children with learning disabilities are common and affect their health and learning, and the health and well-being of their parents and carers. The use of melatonin in this population is growing, but research on its efficacy and safety is conflicting. This article discusses the role of learning disability nurses in supporting children with learning disabilities with sleep problems, describes the prevalence and relevance of sleep issues, introduces some behavioural interventions and gives an overview of the use of melatonin.