Hypersomnia (termed hypersomnolence in DSM-5) is characterized by recurrent episodes of excessive daytime sleepiness or prolonged nighttime sleep. Different from feeling tired due to lack of or interrupted sleep at night, persons with hypersomnolence are compelled to nap repeatedly during the day, often at inappropriate times such as at work, during a meal, or in conversation.
The predominant complaint is excessive sleepiness for at least 1 month (in acute conditions) or at least 3 months (in persistent conditions) as evidenced by either prolonged sleep episodes or daytime sleep episodes that occur at least 3x per week.
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Submitted on: 1-Jun-2000