285x285px Individuals expressing the above symptoms may be diagnosed with<unk>  using a variety of methods and tests.<unk>  specialists measure the patient's<unk>  onset and offset, dim light melatonin onset, and evaluate Horne-Ostberg morningness-eveningness questionnaire results.<unk>  specialists may also conduct a polysomnography test to rule out other<unk>  disorders like narcolepsy. Age and family history of the patient is also taken into consideration.
Advanced sleep phase disorder
Delayed sleep phase disorder
Circadian rhythm sleep disorder
Non-24-hour sleep–wake disorder
Shift work sleep disorder
Nightmare disorder
Rapid eye movement sleep behavior disorder
Idiopathic hypersomnia