Short sleepy clips like this spread on soundboards because they work as instant visual shorthand online, where a few soft tones and a ZZZ reference are enough to mean bedtime. Creators reuse the sound across memes, reaction edits and short videos when a character is exhausted, bored into sleep, or peacefully checked out of a chaotic scene. Its brevity makes it easy to drop in without covering dialogue, and the relaxing mood contrasts well with loud or stressful moments before it. That contrast keeps the clip useful even as editing styles change.