为什么用ZZZ表示睡觉？

[视频作者] 正经的知识

[视频时长] 0:35

[视频类型] 科学科普

参考：https://washingtoncitypaper.com/article/212749/why-does-z-stand-for-snoring-and-how-do-other/ https://www.plushbeds.com/blogs/green-sleep/how-did-the-letters-z-z-z-z-become-synonymous-with-sleep-and-snoring https://english.stackexchange.com/questions/2