From the point of view of medicine, yawning, the process is quite banal. In the human body accumulates a large amount of carbon dioxide, and with a deep breath, absorbed a decent portion of oxygen, resulting in yawning. And it is not necessary to assume that a person yawns only when he wants to sleep. Even now, when you read this article, you can yawn, and then, automatically taking a deep breath, repeat this process again and again, not paying attention to it. A man, being still in the womb, yawns.
A person is particularly prone to yawning, performing some monotonous, boring and monotonous work. Psychologists attending one of the seminars calculated that a person is able to yawn for one hour about 30 times. After each yawn, the person is cheered and it prevents falling asleep. In some countries, enterprises have introduced a special yawn pause. Workers first imitate yawning reflexes, and then it all starts for real. One by one, they are looking at each other, begin to yawn After this pause to start work which, according to experts, is much more active.
Yawning is widespread among mammals, reptiles and fish. During yawning, there is a straightening of the fallen alveoli, the surface of the lungs increases. Yawning also allows you to equalize the pressure in the inner ear. The rate of yawning occurs when fatigue and drowsy condition, stay in a room with a high content of carbon dioxide, after a period of weakening of the breathing, in the absence of muscle activity, etc. Sometimes occurs in various diseases, as a symptom of oxygen starvation of the stem formations of the brain. Yawning is a phylogenetically ancient form of breathing, close to swallowing breath in reptiles and fish, which occurs when the activity of the respiratory center in the brain is weakened.
Note that if a person next to you yawning after you – he knows how to empathize, and be sensitive and responsive.