What causes a yawn?

Question:

I have heard two theories. Being sleepy and your body needing oxergen. Which of the two is correct? If either.

Answers:
when you yawn it means you're either tired or your brain needs more oxygen

Other Answers:
lack of oxygen, which occurs often when you are tired.

A yawn (also known medically as pandiculation) is a reflex of deep inhalation and exhalation associated with being tired, with a need to sleep, or from boredom.
Yawning is a powerful non-verbal message with several possible meanings, depending on the circumstances:

1. An indication of tiredness, stress, over-work or boredom.
2. An action indicating psychological decompression after a state of high alert.
3. A means of expressing powerful emotions like anger, rejection or apathy.

A yawn can express strong anti-social messages, and so in some cultures people try to mute or mask them by placing a concealing hand over the yawning mouth.
Source(s):
http://en.wikipedia.org/wiki/Yawn

More Questions and Answers

The consumer health information on youqa.com is for informational purposes only and is not a substitute for medical advice or treatment for any medical conditions.
The answer content post by the user, if contains the copyright content please contact us, we will immediately remove it.

What causes a yawn?

Health Resources