Sleep disorders are common in people on the autistic spectrum and can affect their development, daily function, and overall well-being. This study examined the effectiveness of non-pharmacological intervention to improve sleep in autistic children and adolescents without intellectual disability. We considered 11 studies of non-pharmacological treatments for autistic children and adolescents. The results indicate that these interventions help to improve several sleep parameters, either by increasing, for example, the total time and quality of sleep, or by reducing the time needed for falling asleep. These approaches offer important treatment options especially for those cases where medication is not feasible, allowing physicians and specialists to propose more targeted and safer solutions for managing sleep difficulties in this population.