What does sleepiest mean?
Sleepiest is the superlative of sleepy and means needing sleep more than anyone or anything else in a particular group or situation. It can describe a person, especially a tired child or passenger, as well as animals, periods of the day, or other circumstances associated with drowsiness. The word is most often used as a predicate or attributive adjective, as in “the sleepiest baby” or “I feel sleepiest after lunch.” Unlike simply saying that someone is sleepy, sleepiest makes a comparison, usually among several people or possibilities. Its tone is generally neutral, though it can appear affectionate when describing a child who looks exhausted. The expression is also useful for identifying the part of a day when people are most likely to feel tired or fall asleep.
adjectiveNeeding sleep most; more ready or inclined to sleep than anyone or anything else.
- Needing sleep most or being more ready to sleep than someone or something else.
"The youngest child was the sleepiest after the long journey."
"She was the sleepiest member of the group and dozed off as soon as she sat down."
"Travel is generally most difficult during the sleepiest hours of the night."
Sleepiest captures the moment when staying awake becomes not merely difficult, but almost impossible.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of sleepiest
The word belongs to the English family formed from sleep, which comes from Old English slǣpan, meaning to rest or take repose. The adjective sleepy was formed within English from the same base, and sleepiest is its standard superlative form. Related words such as sleeper and sleepily continue the same productive word family. The comparison ending -est is a native English pattern still widely used to form superlatives.
Related word forms
How sleepiest is actually used
This is the usual superlative form of sleepy. It is neutral in register and common in both spoken and written English.
Easily confused with sleepiest
Sleepy describes someone inclined to sleep, whereas sleepiest identifies the person or thing that is most inclined to sleep.