I. Introduction Evaluation of sleep problems in children with neurodevelopmental disabilities Polysomnography Actigraphy Actigraphy -- II. Sleep Disorders Insomnia Sleep Related Breathing Disorders Parasomnias Hypersomnia Circadian Rhythm Sleep Disorders Movement Disorders -- III. Neurodevelopmental Disabilities Autism Attention Deficit Hyperactivity Disorder Cerebral Palsy Down Syndrome Down Syndrome Spina Bifida International Adoption Prader-Willi Syndrome and Angelman Syndrome Rett Syndrome Williams Syndrome Tuberous sclerosis Sleep and Epilepsy 22q11 Deletion Syndrome Fragile X Syndrome Intellectual Disability Intellectual Disability Comorbid Psychiatric Disorders -- IV. Treatment Approaches Behavioral & Environmental Approach to Sleep Medications Exercise Melatonin Occupational Therapy and Sleep Complementary and Alternative Medicines for Sleep Procedural Desensitization Procedural Desensitization CPAP Desensitization Transition to Adulthood.