Reasons:
1) Where, there is a discussion/lecture/conversation going on which you don't like and you don't have any interest in that.
2) An intimation to you where sleep is on head.
3) A sign of tiredness.
When we are sleepy or drowsy then our lungs don't take enough oxygen which increases carbon dioxide in our body. The brain senses this and sends us a messages that causes us to yawn. By Akhilesh Sharma
We yawn cause of the lack of oxygen.
No. They yawn for the same reasons we do.
We yawn because when we breath through our mouths it brings in more oxygen than when we breath in through our noses. ( which is what most people do.) Sometimes, our brain doesn't think that its getting enough oxgen so it makes you yawn. Try yawning now - feel how much oxgen comes into your mouth? That's why.
they yawn because when you yawn it passes on to other people . so you yawn then someone's right next to you then i think they inhale then they start to yawn ?
When we are sleepy or drowsy then our lungs don't take enough oxygen which increases carbon dioxide in our body. The brain senses this and sends us a messages that causes us to yawn. By Akhilesh Sharma
We yawn cause of the lack of oxygen.
No. They yawn for the same reasons we do.
We yawn because when we breath through our mouths it brings in more oxygen than when we breath in through our noses. ( which is what most people do.) Sometimes, our brain doesn't think that its getting enough oxgen so it makes you yawn. Try yawning now - feel how much oxgen comes into your mouth? That's why.
they yawn because when you yawn it passes on to other people . so you yawn then someone's right next to you then i think they inhale then they start to yawn ?
well all the chemical and stuff In your ear and the cartilage it usually pops when u yawn or sneeze
yes they yawn quietly
how do you know you yawn if you are sleeping?
No whales do not yawn.
Yes, yawn is an onomatopoeia.
Insects do not yawn. People necessarily do not yawn only when they are tired. Most people, after reading this, will yawn.
A yawn is normally a response to a change in activity, although if you did not get enough sleep, you could become tired and yawn.