Can someone explain to me the significance of the booger bubble that appears in so many anime? In every few anime I watch, I see a character or two blow a booger bubble out of their nose. Any thoughts on the purpose of the booger bubble? Am I the only one who notices or thinks it's gross?

It exaggerates someone sleeping. Not intended to be disgusting, just comedic.

Japanese people like to make everything look cute, even gross stuff like boogers

Isn't it something to do with being sleepy?

Have you never been so tired you blow a great big wet bogey bubble all over your visage?

what is that? I have no idea