
The use of 'Z' or 'zzz' to denote sleep is widely recognised across the globe. The onomatopoeic origin of the symbol is often attributed to the buzzing sound of snoring, resembling a tiny saw cutting through a log. The first use of 'zzz' to represent snoring was in a 1924 publication by the American Dialect Society, although it was popularised in the early 20th century by comic strips such as The Katzenjammer Kids, where a string of 'z-z-z' was shown flowing from a sleeping character's beard. Over time, the symbol became interchangeable with sleep in media and illustrations, with variations in the number of 'z's' indicating the intensity of snoring or peacefulness of sleep.
| Characteristics | Values |
|---|---|
| Onomatopoeia | The sound of snoring or a person sleeping |
| First Used | 1903 in a comic strip called Katzenjammer Kids |
| Variations | zzz, Zzz, ZZZ, zZz, ZzZzZ, etc. |
| Usage | Comic books, cartoons, informal conversations |
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What You'll Learn

The onomatopoeic representation of snoring
The use of "Z"s to represent sleep and snoring has been a common trope in comic strips and illustrations since at least 1903, when it was first used in a comic strip called "Katzenjammer Kids". The artists needed to show an old man asleep in a hammock and chose to depict three Zs floating above him. This choice has been attributed to the locust-like buzzing sound of snoring, resembling the sound made when sawing wood, and the Z-shape created by a saw cutting through a log.
The use of Zs to represent sleep and snoring quickly gained popularity, and by the 1930s, many publications used between three and ten Zs to indicate someone sleeping. In some cases, a single giant Z was used, as seen in later cartoons like "Peanuts" and "Garfield". The American Dialect Society formalized the use of "Zzzz" to represent snoring in 1918, and it soon became a popular idiom, such as "catching some Z's".
While the use of Zs to represent sleep and snoring may have originated from the sound and shape of snoring, it has since taken on a life of its own. Today, it is a widely accepted and recognized symbol for sleep and snoring, even in cases where the snoring may not sound exactly like a "Z" sound.
It is worth noting that the number and capitalization of Zs can vary. Some people write it in all caps ("ZZZ"), while others may capitalize only the middle Z ("ZzZ") or the first Z followed by lowercase z's ("ZzZz"). Regardless of the variation, the Zs are universally understood to represent sleep or snoring.
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The buzzing sound of snoring
The letter "Z" is commonly used to represent sleep and snoring. The use of "Z" to indicate sleep can be traced back to comic strips, where artists would use a series of "Z's" to indicate that a character was asleep. The first recorded use of this was in 1903, in a comic strip called "Katzenjammer Kids", where an old man asleep in a hammock was depicted with three "Z's" floating above him.
The choice of the letter "Z" was likely due to its onomatopoeic quality, resembling the buzzing sound of snoring. Some have likened this sound to a locust-like buzzing, or the sound of a tiny saw cutting through a log, which was also used in early cartoons to represent sleep. Over time, the use of "Z's" to indicate sleep became standardised, with the American Dialect Society formalising the use of "catching some Z's" in 1918.
While the use of "Z's" to represent sleep is now widespread, it is worth noting that some people do not find this symbolisation accurate. The sound of snoring is often described as more guttural or resembling a series of snorts, rather than the smooth, buzzing sound of "Z's".
Despite this, the symbolisation of sleep with "Z's" has become a universally recognised convention, especially in informal contexts and illustrations such as comics and cartoons.
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The shape of the letter Z
The letter Z, with its sharp zigzags, has become synonymous with sleep and snoring. The use of "Zzzz" as an onomatopoeic representation of snoring was formalised by the American Dialect Society in 1918, and it quickly became a popular idiom, such as "catching some Z's". The sound of snoring has been likened to the buzzing of a bee, the whirring of an RC car, or the sharpening of a pencil—all of which can be represented by the letter Z.
The use of Z to indicate sleep in comics and cartoons is especially notable. The letter Z first appeared in this context in 1903, in a comic strip called "Katzenjammer Kids," where an old man asleep in a hammock was depicted with three Z's floating above him. This visual representation of sleep soon took hold, and by the 1930s, publications were using anywhere from three to ten Z's to indicate slumber.
The use of Z to represent sleep has evolved beyond comics, finding its way into our everyday vocabulary. While you won't find "catching some Z's" in formal writing, it is a common phrase in informal conversations. The letter Z has become a symbol of sleep recognised worldwide, with its shape and sound capturing the very essence of slumber.
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The sawing of logs
The use of "Z"s to indicate sleep or snoring first appeared in a 1903 comic strip called Katzenjammer Kids. The artists needed to depict an old man sleeping in a hammock and chose to use three Zs floating above him. This choice was likely due to the locust-like buzzing sound of snoring, resembling the sound of a saw cutting through wood. Early cartoons often depicted a saw cutting wood to represent sleep before the Zs became more common.
The use of Zs for snoring or sleep became a standard in comic books and cartoons, with the American Dialect Society formalizing it in 1918. This led to the popular idiom "catching some Zs." Over time, the letter "Z" became permanently linked to sleep, and snoring became interchangeable with sleep in comics' language.
The use of "Z" for sleep is not limited to English-speaking countries. Even in countries like Australia, where the typical pronunciation of the letter "Z" is "zed", people universally say "zee" when referring to sleep.
While the sound of snoring may not be perfectly captured by the letter "Z", it is an onomatopoeic representation that has become widely accepted and recognized. The shape of the letter "Z" may have also played a role in its association with sleep, as the zigzag shape can be associated with the up-and-down motion of sleep.
So, the next time you hear someone sawing logs, you can picture a series of "Z"s floating above them!
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The difficulty of representing sleep with letters
The letter Z has become synonymous with sleep and snoring, especially in cartoons and comics. The use of "Zzzz" to represent sleep is an example of onomatopoeia, as it is meant to mimic the sound of snoring. However, the idea that "Zzzz" accurately represents the sound of snoring has been disputed, with some arguing that snoring sounds more like a series of snorts or a guttural sound.
The association between sleep and the letter Z can be traced back to at least 1918, when the American Dialect Society formalized the use of "Zzzz" to represent snoring. The choice of "Zzzz" may have been influenced by the locust-like buzzing sound of snoring or the Z-shape created by someone sawing wood, which was also used to represent sleep in early cartoons. By the 1930s, publications were using between three and ten "Zs" to represent sleeping, and the idea had taken hold in popular idioms like "catching some z's".
While the use of "Zzzz" to represent sleep may seem intuitive to some, it is important to note that this association is not universal. For example, in Australia, the letter Z is typically pronounced as "zed", but when referring to sleep, it is pronounced as "zee". Additionally, some individuals have suggested that the shape of the letter Z, rather than the sound it represents, is what makes it an effective symbol for sleep.
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Frequently asked questions
"Zzz" is an onomatopoeia for the sound of snoring. In comics and cartoons, it's common to see a series of "Z's" to indicate that someone is sleeping. The use of "zzz" to represent sleep became popular in the early 20th century and has been a staple of comic book illustrations ever since.
The letter "Z" became linked with sleep due to its shape and the sound it makes. The sound of snoring can be represented by a long, drawn-out "Z" sound, and the shape of the letter "Z" can resemble the up-and-down motion of a person sleeping or snoring.
The use of "zzz" to represent sleep was first recorded in a 1903 comic strip called "Katzenjammer Kids." In the comic, the artists needed to show an old man asleep in a hammock and chose to use three "Z's" floating above him to indicate sleep.
There aren't any solid rules about capitalizing "zzz." It can be written in all caps ("ZZZ"), with only the middle "Z" capitalized ("zZz"), or with the first "Z" capitalized followed by lowercase "z's" ("ZzZ"). The use of "zzz" is generally limited to informal conversations or illustrations.











































