hypersomnia

noun

hy·​per·​som·​nia ˌhī-pər-ˈsäm-nē-ə How to pronounce hypersomnia (audio)
: a disorder of sleep that is characterized by prolonged nocturnal sleep periods which typically occur at least three times a week, by sleep that is not restorative or refreshing, and by the presence of excessive daytime sleepiness

Note: Hypersomnia may occur secondary to a medical condition (such as sleep apnea or depression) or the use of certain medications or may arise spontaneously from an unknown cause.

The International Classification of Sleep Disorders defines idiopathic hypersomnia as a disorder of excessive sleepiness that is associated with major sleep episodes, the cause of which is presumed to lie in the central nervous system.Sudhansu Chokroverty
also : excessive daytime sleepiness not associated with disturbed nocturnal sleep : hypersomnolence
Psychology Today reports that people who persistently fall asleep at their desks may be suffering from the dread hypersomniaCurt Suplee

Examples of hypersomnia in a Sentence

Recent Examples on the Web Dental appliances may help, too.5 Problems Staying Awake A healthcare provider may prescribe medications that treat hypersomnia symptoms. Mara Betsch, Health, 10 June 2023 Two drugs will be compared to a placebo in a trial for excessive daytime sleepiness (hypersomnia). Fran Kritz, Verywell Health, 22 Aug. 2023 One trial will focus on hypersomnia, or excessive sleep, while another will focus on problems falling or staying asleep. Adrianna Rodriguez, USA TODAY, 31 July 2023 People with hypersomnia may want to nap at inappropriate times, like during work or meals. Mara Betsch, Health, 10 June 2023 By now, Anna’s hypersomnia was threatening her livelihood. David Rye, Discover Magazine, 7 Apr. 2014 Hypersomnia: With hypersomnia, staying awake during the day may be hard. Sarah Klein, Health, 13 Mar. 2023 Anna’s case drove us to examine CSF from patients with other forms of hypersomnia. David Rye, Discover Magazine, 7 Apr. 2014 The generic name for Anna’s persistent sleepiness, which no amount of sleep could erase, is hypersomnia. David Rye, Discover Magazine, 7 Apr. 2014

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'hypersomnia.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1863, in the meaning defined above

Time Traveler
The first known use of hypersomnia was in 1863

Dictionary Entries Near hypersomnia

Cite this Entry

“Hypersomnia.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hypersomnia. Accessed 30 May. 2024.

Medical Definition

hypersomnia

noun
hy·​per·​som·​nia -ˈsäm-nē-ə How to pronounce hypersomnia (audio)
1
: sleep of excessive depth or duration
2
: a disorder of sleep that is characterized by prolonged nocturnal sleep periods which typically occur at least three times a week, by sleep that is not restorative or refreshing, and by the presence of excessive daytime sleepiness
The International Classification of Sleep Disorders defines idiopathic hypersomnia as a disorder of excessive sleepiness that is associated with major sleep episodes, the cause of which is presumed to lie in the central nervous system.Sudhansu Chokroverty
also : excessive daytime sleepiness not associated with disturbed nocturnal sleep : hypersomnolence
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