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Zzz is not really a word you say — it is written sleep. It stands for the sound of snoring, and it appears in comics and cartoons in the little cloud above a sleeping character's head, on (💤), in text messages, and in captions. Writers vary it freely: z, zz, zzz, zzzzz, Zzzzzzz. More z's means deeper or longer sleep, and there is no correct number. It does two jobs. The plain one is 'sleeping': you might text a friend at midnight, 'heading to bed, zzz'. The second, and now the more common one online, is 'this is boring' — putting zzz under someone's post means their post put you to sleep. That second use is rude, so read the room before using it. You will also meet 'catch some z's' (or 'get some z's'), a relaxed American way of saying 'get some sleep'. There the z's are counted, with an before the s. As a written sound, zzz has no grammar of its own — it usually stands alone, or sits at the end of a sentence like a small picture.
呼呼大睡的狀聲字（漫畫裡表示睡覺的「Zzz」）；網路上放在留言裡則常表示「無聊到想睡」
組成Not built from smaller pieces. It is a made-up spelling of a sound — someone tried to write snoring with letters, and z was the closest fit. Comics have used it since the early 1900s, and it stuck so well that it became the sleep emoji.
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
zzzintj[zːːː]
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A snoring sound, implying that somebody is asleep.
zzzverb[zːːː]
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To sleep or snore.
- He lay back on his pillow, made a faint zzzing sound that ceased, and presently and quite quietly he died — greatly comforted by my assurance.
- He zzzed for a long time, bobbing back and forth, and then he let us go, pointing to two empty seats across the aisle and motioning for us to sit down.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。