Hypersomnia, or excessive sleepiness, is a condition in which a person has trouble staying awake during the day. People who have hypersomnia can fall asleep at any time; for instance, at work or while they are driving. They may also have other sleep-related problems, including a lack of energy and trouble thinking clearly. According to the National Sleep Foundation, up to 40% of people have some symptoms of hypersomnia from time to time. Hypersomnia can be a primary condition or a secondary condition. Secondary hypersomnia is the result of another medical condition. People with hypersomnia have difficulty functioning during the day because they’re frequently tired, which can affect concentration and energy level.  

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