Insomniac
Insomniac adjective - Not sleeping or able to sleep.
Usage example: an insomniac veteran tormented by his memories of the war
Sleepless is a synonym for insomniac in alert topic. In some cases you can use "Sleepless" instead the word "Insomniac" as an adjective or a noun, when it comes to topics like wakeful. popular alternative
Nearby Word: insomnia
Mutual synonyms
Related pairs
- awake and insomniac
- awake and sleepless
- alert and insomniac
- alert and sleepless
- attentive and insomniac
- attentive and sleepless
- conscious and insomniac
- conscious and sleepless
- restive and insomniac
- restive and sleepless
- restless and insomniac
- restless and sleepless
- disturbed and insomniac
- disturbed and sleepless
Both words in one sentence
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Superintelligent characters sometimes overlap with The Sleepless or The Insomniac (type D), maybe because their mind is too active to ever be put to rest, or because they regard sleep as a waste of time.
Source: Super Intelligence - The Insomniac: Jake has many sleepless nights over the course of the novel as he grapples with his personal demons and those of his social circle.
Source: Literature / The Sun Also Rises -
The Insomniac: The queue video portrays Bruce as this, as the sheer anxiety of trying to complete his work without letting the Hulk come out has left him sleepless for days.
Cite this Source
Sleepless and Insomniac. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/insomniac/sleepless
Insomniac & Sleepless. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/insomniac/sleepless>.
Sleepless or Insomniac. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/insomniac/sleepless.
Google Ngram Viewer shows how "insomniac" and "sleepless" have occurred on timeline