I have been yawning all morning so I decided to look up how a yawn actually occurs. I guess yawning can come from many different things. You can yawn because you are stressed, tired, or bored. You can also yawn because of something as simple as being nervous. Some studies have shown a correlation between the two. I guess there isn't any kind of chemical release or anything. It is just a reflex that humans have. It can have several meanings. Nobody really knows enough about it to actually give a solid answer as to why we yawn. It is mostly just guesswork and theories.
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