Why do we yawn?just wondering

Question

Why do we yawn?just wondering

Answer 1

http://www.coolquiz.com/trivia/explain/d...

http://www.msnbc.msn.com/id/3076713/

Yawning isn't an indication of boredom but it is a way the body gets us alert. Yawning gets oxygen into our body so it may be because our lungs are low on oxygen. There are many different reasons-- check out the websites for more.

Answer 2

When your eardrum stretches simultaneously with breathing in deeply, it produces a yawn, People tend to yawn more when tired, stressed, or nervous.  

Answer 3

Stephhh is correct on that point  caused by lack of oxygen to the brian  http://en.wikipedia.org/wiki/Yawn

Answer 4

weak lungs.

Answer 5

Good question!

Answer 6

For oxygen i think.  

Answer 7

this is a question that is yet unanswered, although there are lots of interesting theories and studies on yawning out there...

like the way this post actually makes me want to yawn

*yawn*

Answer 8

don't know

Answer 9

We do yawn when we are tired and we do yawn because of lack of oxygen.  No one knows why we yawn when we someone else yawn.  In fact, you may have yawned reading this

Answer 10

not enough oxygen in the blood stream- your body is trying to pack more in. Also, I hear that it will happen if your breathing is out of synch with your heartbeats, or vice versa... not sure.

Answer 11

Increase in carbon dioxide and decrease in oxygen results to yawning.  

Answer 12

Lack of oxygen

Answer 13

We yawn to get our brain more oxygen.

Answer 14

reflex

Answer 15

to release built up air caught in your lungs .  

Answer 16

I think we yawn because that's a way of our body showing us that it needs sleep because we aren't completely awake yet.  

Or another reasoning may be is that if we have been awake it could tell us that we are tired, and need some rest.  

Answer 17

who know's?

Answer 18

Its when you're tired or such that less oxygen gets to your brain, the yawn takes in loads to refresh it :D

Answer 19

its a way the body responds to lack of sleep

Answer 20

to get more oxygen in our body