Sleep Disturbances in Adults with Autism Spectrum Disorders and Severe Intellectual Impairments

Sleep disturbances are a significant problem for persons with developmental disabilities. These problems occur at a higher rate than what is observed in the typically developing population, and persons with Autism Spectrum Disorders (ASD) appear to be at a higher risk than individuals with other developmental disabilities. However, another major risk is intellectual disability (ID). These two groups of disorders overlap to a substantial degree. Thus, persons with ASD and ID appear to be particularly susceptible to sleep disturbances. These sleep problems can have serious consequences beyond sleep, particularly with respect to increased challenging behaviors and as an impediment to learning. Despite these concerns, adults with ASD and ID have been largely neglected with respect to the study of these nocturnal difficulties. In this report, 168 adults with ASD and ID were compared to 166 adults with ID alone in regard to sleep disturbance and related difficulties. Individuals in the ASD group presented with much higher rates of sleep disturbances, and greater severity of sleep disorder was related to the expression of more serious challenging behaviors. The implications of our results are discussed for future assessment and treatment of these disorders.