This certification is designed for individuals who have a subspecialization in the diagnosis and management of sleep-related clinical conditions, including circadian rhythm disorders. This subspecialty includes the clinical assessment, polysomnographic evaluation and treatment of sleep disorders including insomnias, disorders of excessive sleepiness (e.g. narcolepsy), sleep related breathing disorders (such as obstructive sleep apnea), parasomnias, circadian rhythm disorders, sleep related movement disorders and other conditions pertaining to the sleep-wake cycle.