Why and how is yawning contagious?
Answers: I'm yawning just reading just about yawning!
The other theory I've read is that yawning is supposed to afford one's system a shot of oxygen in directive to ready it for a possible crisis (fight / flight) situation. Notice that yawning occur not just as a result of sleepiness, but also stress.
The contagious aspect of yawning derives from an adjectives tribal mechanism; if one extremity of the tribe perceives a possible impending crisis, contagious yawning prepares all member of the tribe for it.
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I've read scientific articles something like yawning in apes, and how males yawn to show their teeth (their power over other apes.) and womanly apes yawn to show the males they want to have sex.
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