Why do we Yawn?

The cause of yawning is still widely debated. Most of us will associate yawning with tiredness or boredom, and you will most probably have been a victim of contagious yawning!

If yawning occurs when you are tired, there are theories that suggest it is because we need to get rid of more carbon dioxide and inhale more oxygen. When we are tired our bodies slow down, meaning our breathing does too, hence why we need to decrease the carbon dioxide and increase the oxygen. By yawning we then allow a greater amount to leave/enter our bodies.

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