Why society yawn?
Answers: Short answer: no one know.
Possible, unproven answer: to modulate (regulate) oxygen balance. People repeatedly yawn when their bodies are low on oxygen, breathing shallowly for some reason, while yawning forces them to breathe more intensely, taking in more oxygen.
Strangely satisfactory, some animals (like lions) yawn when they're excited, as in of late about to confrontation or hunt. Don't know if that's relevant (maybe it just looks close to yawning), but they also yawn when tired or sleepy, or just wake up.
Don't ask why yawning's contagious. No one knows that any, of course.
To seize ready for bed, conceivably.
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