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Primary sleep disorders are categorized into 2 subtypes, dyssomnias and parasomnias. Whereas dyssomnias are defined by qualitative and quantitative measures of sleep, parasomnias are characterized by problems in the behavioral or physiologic aspect of sleep.
Studies have shown that patients with insomnia are much more likely to exhibit a mental disorder. Recent developments in the areas of sleep disorders and mental illness have indicated an association between anxiety or stress, attentiondeficit/ hyperactivity disorder in children, and Alzheimer's disease in older patients.