Zzz has become a universal visual and audio shorthand for sleep, used in cartoons, comics, memes, and short videos to signal boredom, tiredness, or someone switching off. Because it needs no words, it travels easily across languages and platforms, appearing in reaction clips, sleep edits, and comedy sketches. Its length makes it useful for holding a joke for several seconds, rather than a quick one-note gag, which is why creators keep returning to it for slow, drowsy moments.