What does zzz mean?
“Zzz” is an informal written expression for sleep, snoring, or a person being asleep. As an interjection, it imitates the low buzzing or snoring sound associated with sleeping: “By nine, zzz—he was completely exhausted.” As a noun, it can refer to a short period of rest or sleep, especially in phrases such as “catch a quick zzz.” The expression is playful and familiar rather than formal, and it commonly appears in captions, cartoons, messages, and informal writing. Although “zzz” conveys a sound, its multiple repeated letters also create a visual impression of someone drifting off. It is useful in contexts where a fuller expression such as “falling asleep” would be too formal or unnecessarily detailed. The form belongs to the English tradition of written onomatopoeia, representing sounds through letters that approximate how they are heard.
An informal term for a short period of sleep.
"She managed to catch a quick zzz before work."
Usually singular and informal; a plural form is used only when referring to multiple periods of sleep.
A written representation of snoring or of a person sleeping.
"By ten o'clock, zzz—he was fast asleep."
Commonly repeated to imitate a sustained snoring sound and often used in captions, cartoons, and informal writing.
The plural is occasionally used in expressions such as “catch some zzzs”; for one period of sleep, the singular is more usual.
"He got through the day on coffee and a couple of zzzs."
Three letters and a shared understanding: zzz has communicated sleep almost instantly for generations.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Related word forms
How zzz is actually used
Informal, playful, and especially common in written conversation, captions, cartoons, and other visual media. It is usually written in lowercase, although capital letters may be used for emphasis.
Easily confused with zzz
A doze is a light period of sleep and is normally used as a verb, whereas zzz is an informal written symbol for sleep or snoring.