The investigators hypothesize that use of an educational story with pictures illustrating overnight sleep study procedure (also called polysomnography or PSG)accompanied by simple narrative will be a cost-effective, readily accepted intervention that will contribute to successful completion of sleep studies among children with disabilities. Children who have been referred for a clinical sleep study at Kennedy Krieger Institute (KKI) will be enrolled and randomized to either recieve usual care (discussion of polysomnography with referring clinicians) or educational story intervention. Both groups of participants will be asked to complete questionnaries before and after the sleep study. Set-up for the sleep study will be videotaped so that behavior of the child can be evaluated. The investigators will evaluate whether successful study completion differs between the two groups.