Even more complex? Why we seem to yawn because other people are yawning. Here are some fast facts on why we yawn and why yawning can be contagious – even between dogs and humans and over the phone.
Why Do People Yawn More When They Feel Tired A tired brain ... The additional oxygen might improve the short-term wakefulness ...
with one study suggesting that people yawn more during winter than in summer, when the air outside is cool enough to make a difference. Excessive yawning can be short or long-term and is ...
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