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Yawning is so fascinating. It's often contagious, even between humans and other animals, it's an involuntarily reaction and can happen repeatedly in quick succession like sneezing, and reading and/or thinking about it can trigger it (as has happened to me multiple times while writing this).
I can't directly answer your question, but what I can say is that it must be important as far as evolution is concerned. In addition to all of the above, it negatively impacts multiple important senses simultaneously, and to your point, we can somehow feel whether or not the yawn was sufficiently satisfying.
Even just reading the word 'yawn' makes me feel the need to yawn. I gotta imagine that's because my brain is visualizing someone yawning when I read the word.
I've yawned like 6 times since opening this thread.
Agree -it's super interesting! I took a med that made me yawn a lot. Was weird, but it also helped reduce murder urges, so that was worth it. Studies show that some people with autism don't catch yawns.
It really is. Friend of mine had a cat that would meow in a special way every time a human yawned. We tried endlessly to fool it by fake yawning, but it could tell every time and only meowed during real yawns.