Definition of "hypersomnia" [hypersomnia]

• Excessive sleepiness (noun)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "About 9 to 10 percent have what is known as hypersomnia, meaning that they have excessive sleepiness, both at night and during the day."
• "About 90 percent had something known as hypersomnia, which means that they sleep too much at night."
• "Are there any proven treatments for hypersomnia, or excessive sleeping? —"