Why do we yawn when we feel sleepy?

@janebeth (2033)
Philippines
September 22, 2009 9:08pm CST
hi friends, Theory No.1: A yawn is your body’s operandi to take more oxygen into blood while yanking more carbon dioxide out of your fluid. It happens as an auto reflex.. i always yawn when i am sleepy and specially when i saw someone who yawn also, and i can't stop it.. and the person next to me will also yawn because she saw me yawning, .. so we keep on yawning the whole day, hahaha!! how about you friends, have you tried this?? do you yawn always?? have a great day and happy myLotting to all of you..
1 person likes this
6 responses
@mohitseth (568)
• India
23 Sep 09
its due to chemical reaction that takes place in our body. yawning address owr mind that we need rest and at last our minds switch off at that time.
1 person likes this
@janebeth (2033)
• Philippines
23 Sep 09
i also agree with that mohitseth, maybe all we need t do is rest and go to sleep whenever we can feel that we are really going sleepy..
• Indonesia
23 Sep 09
This is the first time i heard that yawn is contagious, hehehe. And of course i yawn too when im sleepy, especially in a boring meeting or in a boring class. Yawn is fun, and when i do it, i do it with moving my hand aside. It feels so great. Now i feel like yawning. Happy mylotting for you too
1 person likes this
@janebeth (2033)
• Philippines
23 Sep 09
really you did not notice that?? it's really contagious.. and it always happen to me.. all the time,
@neildc (17251)
• Lapu-Lapu City, Philippines
23 Sep 09
hi jane. this is something i can't understand, why is that when you see someone yawns, you will also do. and when someone sees us yawn, they will also do? anyway, thanks for sharing this theory about yawns.
1 person likes this
@janebeth (2033)
• Philippines
23 Sep 09
i still can't understand this neil, why and why??
23 Sep 09
Hi janebeth, I have been yawning all evening, even talking about it is making me yawn Tamara
1 person likes this
@janebeth (2033)
• Philippines
23 Sep 09
well i also yawn now when i saw your yawn smiley..
@amyson (3509)
• Philippines
5 Oct 09
yes and often times it makes me sleep when i travel long hours.i also yawn if my teacher is boring to teach way back in college,it is said that carbon dioxide accumulate more in the brain that is why we need to inhale and exhale so that carbon dioxide will be out so oxygen can set inside our brain.happy mylotting..
• United States
30 Sep 09
i will even yawn if i am writing in my book that some one does.. how sad is that?!?! but yeah i yawn when others do and all day long..