What is a yawn and why do people yawn? Yawning has fascinated people for hundreds of years, and many superstitions and myths have been created over the years.
Today we know that a yawn is a reflex of inhalation and exhalation that draws more oxygen into the bloodstream. A reflex is a built-in physical reaction that people often do not have control over. A yawn is often associated with a person being tired, but this is not always the cause for a yawn. People yawn for many reasons including stress, boredom, emotion and over-work.
Have you noticed that yawning seems to be contagious? If one person yawns, this appears to cause another person to yawn. Researchers have found that 40-60% of people who see a picture of someone yawning will yawn themselves. Even reading the word YAWN can make people yawn. Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/opinion-polls/29804-why-we-yawn-is-yawning-contagious.html
Although this “contagious” yawning behavior is not understood, it has been suggested that this could be the result of an unconscious herding behavior — a subtle way to communicate group behavior, such as when a birds follow the behavior of one bird, and all rise together as a whole flock.
Maybe a yawn is a signal to the group that it’s time to go to sleep. Or if someone yawns when they’re bored, it may be a sign to change the topic of conversation.
Yawning is not limited to humans. Animals of all types yawn. If you have a dog or cat, you’ve probably seen your pet yawn several times. Even some birds yawn such as cockatiel parrots, Adelie penguins and Emperor penguins.
Did you yawn while viewing the following video? Reply to Poll!
Some of the more scientific explanations of why we yawn are caused by physical needs. One likely explanation is that the yawning reflex is triggered when our blood needs more oxygen. The deep breath helps replenish the levels of oxygen in our blood. Another common theory is that the yawn help regulate our body temperature. Other hypotheses suggest that the same chemicals in our brain that affect our moods and emotions cause us to yawn.
Some people think that yawning is rude and suggests that you are bored or uninterested. Superstitions about yawning have been around for hundreds of years and stem from the ancient Greeks. A common superstition says that a person must cover his or her mouth when yawning so that the soul does not escape through the mouth. Other superstitions say that yawning is a sign that danger is near. Today most people do not believe these superstitions and know that a yawn is a physical reflex.
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It is contagious roopsidhuji. It has to be. Because each time I check this thread and read about yawning, I can't help myself, I start yawning. Big ones. I just yawned 5 seconds ago. It only takes mere mention to take effect. I am yawning again. And it is weird.
The following members appreciate Narayanjot Kaur Ji for the above message.
SSA,
Most of us who had travelled in buses might have noticed that it used to be written in the buses that on seat number 1, 2 and 3, sleeping is prohibited. Most of people yawn before sleeping, passengers sitting on eats 1,2,3 seats were very close to the driver. As the yawning is contagious, there were always chances of driver start yawning and feeling sleepy. All what I meant by writing this is that this situation explains that since long times it was understood that yawning is contagious. Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=29804 Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=29804
Roopsidhu
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I am yawning right now -- just reading the title before loading the page to check. That is how suggestible I am. Did you ever travel to a harbor area, like San Francisco or Vancouver, or Pacific destinations in South America? There on the fishing wharves and lazing about on barges and platforms at sea are hundreds of seals and walruses. One yawns, it starts the entire brood -- and every one watching them is yawning too. And now I am yawning just thinking about it. Hah Hah
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I am yawning again. And it is weird. 
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