[post_page_title]Scientists do not know why people yawn[/post_page_title]
Yawning is contagious. You see someone across the room open their mouth wide and breathe in deeply and you can’t help but do the same. But why do we do it? Yawning is an involuntary reflex that often occurs before or after sleep, or when a person is bored or lacking stimulation. A number of theories have been proposed to explain why we yawn including to convey boredom, to cool the brain, or to pump more oxygen into the blood. However, there is no accepted explanation for the common phenomenon.
Healthy snacks you can easily make yourself
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