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In order to diagnose idiopathic hypersomnia, a person must display symptoms of hypersomnia for at least 3 months and the disorder should have a significant impact on the person's life. If symptoms occur due to medication or a medical disorder, then the person won't be diagnosed with hypersomnia.
Making a diagnosis of idiopathic hypersomnia requires carefullly excluding other causes of daytime sleepiness such as insufficient sleep (sleep deprivation), disturbed nocturnal sleep, insomnia, circadian rhythm disorders, sleep-related breathing (sleep apnea) disorders or medical issues.
A general medical check up excluding anemia, hypothyroidism, heart or other general medical issues is essential. Excluding a psychiatric condition such as depression or generalized anxiety disorder may be difficult and is needed, requiring therapeutic trials.