The Gaping Yawning Chasm

Do you yawn more when tired than when you've just woken up? This is the gaping gap of yawn's yolk in 'chasmology', the study of yawning! Why you do it, when, and what brings it on? One quirk is that all vertebrates reptiles, sharks, lions, kittens, and their babies all yawn and its highly contagious. It spreads in a room and a zoo. One yawn can make all others yawn when seeing a yawn in their face. It's simply irresistible! You can't stop it, even if you wanted to! Strangely, the stress from overexertion, pent-up expectation, and the quiet stagnation of boredom can all trigger a yawn, even if quashed! Bored babies even yawn in the womb. Close friends yawn in unison. Much more often than strangers jointly gape together! Interesting stuff. Huh! Have you yawned yet?