I can’t a confirm this, but I think it became the standard in comics and other images because the sound of Z is *very vaguely* onomatopoetic of the sound that someone might make while breathing in their sleep. “Sleep breathing” is not a pure S sound, or the sound of a sigh/open mouthed breathing all the time (which are both called fricatives) but it can have a tiny bit of breathy vocalization depending on the positioning of the tongue and airways. S is an unvoiced fricative, and its voiced counterpart is Z; F and V form a similar unvoiced/voiced fricative pairing, as is the “th” in “the” (the unvoiced) contrasted with the “th” in “think” (the voiced).
I feel like I did read this at one point (about why we use Z) but honestly I can’t remember the source.
The letter “Z” is associated with sleep because of the sound it makes when people imitate snoring. “zzzz” is used to represent the sound of someone sleeping and snoring. Over time, it became a common symbol for sleep in cartoons, comics, and other media. So, when you see “Zzz” in writing or drawings, it’s a fun and easy way to show that someone is asleep.
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