“Hypersomnia: Symptoms, Causes &amp; Treatment.” Cleveland Clinic, https://my.clevelandclinic.org/health/diseases/21591-hypersomnia#diagnosis-and-tests. 

University of Texas at Austin

According to the DSM 5,  you would be diagnosed if:

- one experiences excessive sleepiness even with at least 7 hours of sleep and has at least one symptom out of these three: lapsing into sleep several times in the same day, getting more than nine hours of sleep and not feeling refreshed/awake, not feeling completely awake after an abrupt awakening
- one experiences hypersomnia at least 3 times a week for at least 3 months
- hypersomnia causes significant distress or impairment in mental, social, or other areas of life 

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