Editing Advanced sleep phase disorder (section)

== Diagnosis ==
[[File:Sleep studies.jpg|thumb|Among other methods, sleep studies, or polysomnography, are used to diagnose ASPD.|285x285px]]
Individuals expressing the above symptoms may be diagnosed with ASPD using a variety of methods and tests. Sleep specialists measure the patient's sleep onset and offset, dim light melatonin onset, and evaluate [[Morningness-eveningness questionnaire|Horne-Ostberg morningness-eveningness questionnaire]] results. Sleep specialists may also conduct a [[polysomnography]] test to rule out other sleep disorders like [[narcolepsy]]. Age and family history of the patient is also taken into consideration.<ref name=":1" />