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Hypersomnia is feeling sleepy throughout the day or sleeping too long at night and having trouble waking up. People with hypersomnia may fall asleep at inappropriate times, for example, at work. Hypersomnia happens sometimes because nighttime sleep is disturbed because of sleep apnea, but it can also have other causes.Join our online support group for people with hypersomnia and their families. Ask your questions to experts and share your experiences.