sleepiness

noun

Definition of sleepinessnext
as in drowsiness
the quality or state of desiring or needing sleep the truck driver keeps a thermos of coffee with him to stave off sleepiness

Synonyms & Similar Words

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Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Recent Examples of sleepiness Consuming the oil or leaves can cause vomiting, dizziness, sleepiness, and muscle weakness. — Sarah Bence, Verywell Health, 25 Aug. 2026 Takeda is testing orexin-targeting drugs for sleep apnea and chronic daytime sleepiness. — Harriet Marsden, TheWeek, 20 Aug. 2026 Adherence is often low, and untreated sleep apnea can worsen hypertension, atrial fibrillation and the daytime sleepiness. — Jesse M. Pines, Forbes.com, 10 Aug. 2026 Chamomile contains apigenin, an antioxidant that has been shown to promote sleepiness and sleep quality. — Mura Dominko, Martha Stewart, 9 Aug. 2026 Throughout the studies, participants also reported less daytime sleepiness, less frequent muscle weakness, and greater attentiveness. — Elaine Chen, STAT, 5 Aug. 2026 Loud snoring, daytime sleepiness and obesity are common signs. — Hanna Wickes, Kansas City Star, 4 Aug. 2026 Melatonin the hormone released at night that triggers sleepiness also declines with age, and perimenopause brings a significant drop that makes sound sleep harder to come by. — Hanna Wickes, Fort Worth Star-Telegram, 17 July 2026 Gamma-wave strength rose across brain regions during therapy, and sleepiness was the most common side effect. — Samantha Agate, Sacbee.com, 13 July 2026
Recent Examples of Synonyms for sleepiness
  1. drowsiness
  2. fatigue
  3. sleeping
  4. somnolence
Noun
  • Mild effects, such as drowsiness, headache, insomnia, nausea, and vomiting, are common.
    — Encyclopedia Britannica, Encyclopedia Britannica, 28 Aug. 2026
  • But Peasley also lives with Type 1 diabetes and wanted to avoid the potential fogginess and drowsiness that can accompany anesthesia.
    — Marlee Ginter, CBS News, 28 Aug. 2026
Definition of drowsiness
Noun
  • Chaos fatigue isn’t the only side dish being served with the recent rash of court orders; chaos consequences appear to be on a platter as well.
    — Dana O’Neil, CNN Money, 4 Sep. 2026
  • West Nile symptoms A full 80% of those infected may not show symptoms, but 20% have flu-like symptoms, such as a fever with headache, body aches, joint pains, vomiting, diarrhea, rash or fatigue.
    — Charlotte Observer, Charlotte Observer, 4 Sep. 2026
Definition of fatigue
Noun
  • Beyond the basics like comfortable clothing and sturdy hiking shoes, campers often need tents, sleeping bags, camp chairs, lanterns, and coolers to stay comfortable outdoors.
    — Kaitlin Marks, Travel + Leisure, 3 Sep. 2026
  • Positioned above the bathroom and downstairs bedroom, it's accessed by some steps and looks large enough to be used either as a secondary sleeping space for guests or as a storage area.
    — New Atlas, New Atlas, 2 Sep. 2026
Definition of sleeping
Noun
  • From there, the story builds on the uncertainty, rocking the somnolence of a small town in the province of Badajoz, and forcing a community to choose between disbelief and the need to prove what can’t be seen.
    — Emiliano De Pablos, Variety, 9 Feb. 2026
  • The people went to the emergency department with tachycardia, confusion, anxiety or somnolence, and nausea after eating gummy candies labeled as containing Amanita muscaria mushrooms.
    — Beth Mole, Ars Technica, 19 July 2024
Definition of somnolence

Browse Nearby Words

sleep in
sleepiness
sleeping
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Cite this Entry

“Sleepiness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/sleepiness. Accessed 8 Sep. 2026.

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