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| Property | Value |
|---|---|
| URL | https://www.merriam-webster.com/dictionary/insomnia |
| Last Crawled | 2026-03-28 10:07:29 (9 days ago) |
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| Meta Title | INSOMNIA Definition & Meaning - Merriam-Webster |
| Meta Description | The meaning of INSOMNIA is prolonged and usually abnormal inability to get enough sleep especially due to trouble falling asleep or staying asleep. How to use insomnia in a sentence. |
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| Boilerpipe Text | :
prolonged and usually abnormal inability to get enough sleep especially due to trouble falling asleep or staying asleep
chronic
insomnia
Insomnia
is a patient-reported problem characterized by difficulty falling asleep or difficulty maintaining sleep; ie, frequent awakenings, difficulty returning to sleep after awakenings, or awakening too early with inability to return to sleep.
—
Daniel J. Buysse
Word History
Etymology
Latin, from
insomnis
sleepless, from
in-
+
somnus
sleep — more at
somnolent
First Known Use
1739, in the meaning defined
above
Time Traveler
The first known use of
insomnia
was
in 1739 |
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# insomnia
## [noun](https://www.merriam-webster.com/dictionary/noun)
in·som·nia
[in-ˈsäm-nē-ə](https://www.merriam-webster.com/dictionary/insomnia?pronunciation&lang=en_us&dir=i&file=insomn01 "How to pronounce insomnia (audio)")
[Synonyms of *insomnia*](https://www.merriam-webster.com/thesaurus/insomnia)
Simplify
Simple definitions use shorter wording to explain meanings more clearly
**:** prolonged and usually abnormal inability to get enough sleep especially due to trouble falling asleep or staying asleep
chronic insomnia
Insomnia is a patient-reported problem characterized by difficulty falling asleep or difficulty maintaining sleep; ie, frequent awakenings, difficulty returning to sleep after awakenings, or awakening too early with inability to return to sleep.
—
Daniel J. Buysse
## Synonyms of *insomnia*
Relevance
- [restlessness](https://www.merriam-webster.com/dictionary/restlessness)
- [wakefulness](https://www.merriam-webster.com/dictionary/wakefulness)
- [sleeplessness](https://www.merriam-webster.com/dictionary/sleeplessness)
- [alertness](https://www.merriam-webster.com/dictionary/alertness)
[See All Synonyms & Antonyms in Thesaurus](https://www.merriam-webster.com/thesaurus/insomnia)
## Examples of *insomnia* in a Sentence
has suffered from *insomnia* virtually his entire life
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. [Read More](https://www.merriam-webster.com/dictionary/insomnia) Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. [Send us feedback](https://docs.google.com/forms/d/1GAQr3Kn1cURCVHUA82hAga1Wv8DCH0IuqDLRUrOpN7M/viewform?ts=63f4f653&entry.1515682415=https://www.merriam-webster.com/dictionary%2Finsomnia).
Its owners have noted chilling ill effects after the art’s arrival, like *insomnia*, nightmares, and a sense of being constantly watched.
—
*Literary Hub*, 19 Mar. 2026
Users say taking small doses of psilocybin or LSD does everything from bolster productivity and creativity to ease symptoms of anxiety and *insomnia* — all without the hallucinogenic effects characteristic of a full-blown trip.
—
Tiney Ricciardi, *Denver Post*, 18 Mar. 2026
Middle-of-the-night *insomnia* is common.
—
Anahad O’Connor, *Washington Post*, 18 Mar. 2026
Heart palpitations, intense fear or *insomnia* drive people to seek care, while attention symptoms are less recognized.
—
Deldhy Nicolás Moya Sánchez, *The Conversation*, 16 Mar. 2026
[See All Example Sentences for *insomnia*](https://www.merriam-webster.com/sentences/insomnia)
## Word History
Etymology
Latin, from *insomnis* sleepless, from *in-* + *somnus* sleep — more at [somnolent](https://www.merriam-webster.com/dictionary/somnolent)
First Known Use
1739, in the meaning defined [above](https://www.merriam-webster.com/dictionary/insomnia#h1)
Time Traveler
The first known use of *insomnia* was in 1739
[See more words from the same year](https://www.merriam-webster.com/time-traveler/1739?src=defrecirc-timetraveler-etycard)
## Browse Nearby Words
[in some senses](https://www.merriam-webster.com/dictionary/in%20some%20senses)
insomnia
[insomniac](https://www.merriam-webster.com/dictionary/insomniac)
[See all Nearby Words](https://www.merriam-webster.com/browse/dictionary/i/23)
## Cite this Entry
Style
“Insomnia.” *Merriam-Webster.com Dictionary*, Merriam-Webster, https://www.merriam-webster.com/dictionary/insomnia. Accessed 28 Mar. 2026.
[Copy Citation](https://www.merriam-webster.com/dictionary/insomnia)
## Kids Definition
insomnia
noun
in·som·nia
[in-ˈsäm-nē-ə](https://www.merriam-webster.com/dictionary/insomnia?pronunciation&lang=en_us&dir=i&file=insomn01 "How to pronounce insomnia (audio)")
**:** prolonged inability to sleep
## Medical Definition
insomnia
noun
in·som·nia
[in-ˈsäm-nē-ə](https://www.merriam-webster.com/dictionary/insomnia?pronunciation&lang=en_us&dir=i&file=insomn01 "How to pronounce insomnia (audio)")
**:** prolonged and usually abnormal inability to obtain adequate sleep especially due to difficulty falling asleep or staying asleep
called also agrypnia
## More from Merriam-Webster on *insomnia*
Nglish: [Translation of *insomnia* for Spanish Speakers](http://www.nglish.com/spanish/insomnia)
Britannica.com: [Encyclopedia article about *insomnia*](https://www.britannica.com/EBchecked/topic/289169/insomnia)
Last Updated:
20 Mar 2026
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| Readable Markdown | **:** prolonged and usually abnormal inability to get enough sleep especially due to trouble falling asleep or staying asleep chronic insomnia Insomnia is a patient-reported problem characterized by difficulty falling asleep or difficulty maintaining sleep; ie, frequent awakenings, difficulty returning to sleep after awakenings, or awakening too early with inability to return to sleep.— Daniel J. Buysse
Word History
Etymology
Latin, from *insomnis* sleepless, from *in-* + *somnus* sleep — more at [somnolent](https://www.merriam-webster.com/dictionary/somnolent)
First Known Use
1739, in the meaning defined [above](https://www.merriam-webster.com/dictionary/insomnia#h1)
Time Traveler
The first known use of *insomnia* was in 1739 |
| Shard | 122 (laksa) |
| Root Hash | 12021194709005532322 |
| Unparsed URL | com,merriam-webster!www,/dictionary/insomnia s443 |