Causes of Yawning
February 25, 2009
We all yawn, when bored, when tired and during various instances. Also, many a times you will catch a student yawning in class, an employee yawning in office, and sometimes we involuntarily tend to yawn during important meetings and gatherings. Have you ever wondered what cause lies behind the yawning of a person?
Yawning is usually associated with one being tired and feeling sleepy. While yawning is a normal phenomenon, there are times when we tend to yawn more than normal. As mentioned before, drowsiness and weariness are the main causes behind yawning. However, why yawning takes place is a question with various answers and theories.
According to the oldest yet most popular and medically proved theory, yawn is induced due to lack of oxygen in the lungs and body along with an excessive build-up of carbon dioxide. Opening the mouth wide while yawning is taken as a way to provide the body with enough oxygen supply.
Disorders associated with excessive daytime sleepiness are also responsible for yawning. According to a recent hypothesis, yawning is a phenomenon which leads to the regulation of temperature by the body. There are also others who look at yawning as a stretching exercise for the muscles and joints.
Almost all of us know that yawning is contagious. That is to say, if one person yawns in a class or a room, every other person present there gets affected by it and starts yawning. While this is fact, the scientific theory and cause behind this fact is still being discovered.
The cause behind yawning is an interesting area that is till being discovered by our scientists. After all, all secrets of nature are not yet revealed. However, one thing is for sure. Yawning is not restricted to humans as animals like cats, dogs and even fishes- all yawn.
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