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- Hypersomnolence disorder is characterized by repeated excessive sleepiness after at least seven hours of a main sleep period.
- In other words, repeated excessive sleepiness despite getting at least seven hours of sleep.
- Individuals with hypersomnolence and cataplexy are diagnosed with narcolepsy, as are hypersomnolent patients with specific sleep testing results.
- Hypersomnolence disorder is considered a sleep-wake disorder in DSM-5