Synonyms of sleepiness

sleepiness

noun

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

• drowsiness
• fatigue
• sleeping
• somnolence
• tiredness
• resting
• lethargy
• slumbering
• doziness
• weariness
• torpidity
• sluggishness
• torpor
• lassitude
• dozing
• oversleeping

Antonyms & Near Antonyms

• insomnia
• consciousness
• wakefulness
• awareness
• sleeplessness

Example Sentences

Recent Examples of sleepiness

In young children, THC intoxication can cause profound sleepiness, confusion, impaired coordination, vomiting and changes in heart rate. — Katia Hetter, CNN Money, 10 Sep. 2026

To sleep, no more Two scientists who identified the role that a key neuropeptide plays in the uncontrollable sleepiness of narcolepsy were one of three recipients of the prestigious Lasker Awards, announced Thursday. — O. Rose Broderick, STAT, 10 Sep. 2026

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

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