When we feel tired, we yawn, why?

This is because yawning is an involuntary behavior, and when people feel tired, they will unconsciously yawn, and yawning is to help people absorb more oxygen and make their brains more awake.

This is because when you feel tired, your eyes will be very dry, and you will also yawn, which is a normal physiological reaction, and the cranial nerves will respond accordingly.

In this way, the oxygen content in the body can be increased, and carbon dioxide can also be excreted from the body in time.

What are the reasons for yawning.

Zhang Zhaoxu, Deputy Chief Physician.

Department of Neurology, Peking University People's Hospital.

Yawning is a very natural reaction, it is not controlled by the person himself, it has a protective effect on the human body. The specific causes of yawning are tiredness, overuse of the brain, lack of oxygen, etc., and the specific content is as follows:

1) Tiredness: In life, you should pay attention not to stay up late, ensure sufficient sleep time, exercise properly, keep your mood happy, and avoid excessive psychological pressure. Because people are also yawning when they are sleepy and tired, this is a reminder to the human body, indicating that the brain is tired and needs to rest and sleep, so yawning is also a method of hypnosis.

2) Overuse of the brain: When people are tired, anxious, and overuse of the brain for a long time, they may yawn. If you yawn a lot, and at the same time often look at the computer and often play with your mobile phone or keep your head down for a long time, if we can't replenish energy in time, the brain will be deprived of oxygen or brain cells will be in a state of fatigue, so there will also be frequent yawning behavior.

3) Insufficient oxygen: If you are not enough oxygen in the environment, you will always stay in a place where oxygen is insufficient, and hypoxia will also lead to yawning. Some people also yawn before entering high-intensity or high-intensity work, because yawning will speed up the body's blood circulation, thereby adding more oxygen, which will greatly increase the activity of the brain, and brain cells will be active.

When our body feels tired, it means that the body has produced too much carbon dioxide, and when there is too much carbon dioxide, it needs to increase the oxygen in the body to maintain the body's needs, so the body will automatically trigger the "protective mechanism" to inhale more oxygen by yawning, which is why the body yawns when it is tired.

Because when people are tired, the oxygen supply to the brain is not particularly sufficient, and when yawning, the oxygen supply to the brain can be better and the condition of the body can be adjusted.

This is because if people feel tired, then blood sugar will be relatively low, and there will be a certain lack of oxygen in the brain tissue, and they will yawn.

It should be an involuntary behavior, which can effectively relax our tense nerves and not be in a state of excessive hypoxia.

Because it is a natural reaction of the human body, and yawning can make the body a little more comfortable.

Yawning is a bodily signal, just like when we feel dry when we are dehydrated or hungry when we have no food in our stomach, it is a reminder to rehydrate and eat immediately to avoid discomfort. Yawning tells you that your body is deprived of oxygen, which may be caused by tiredness or other problems, and you need to pay more attention. When we are tired, the oxygen levels in our bodies decrease and brain activity slows down.

In order to protect themselves, they will yawn intermittently to deepen their breathing, increase the oxygen level in the body, and speed up blood circulation. In addition, when we yawn, we usually close our eyes, open our mouths, and tighten the muscles of our face, neck, tongue, throat, and limbs before relaxing. This series of movements stretches the muscles and clears away fatigue.

If you keep yawning, it's best to put down what you're doing and rest right away. However, some people yawn even when they are not tired, for example, in an indoor environment with poor air quality, because the amount of haemoglobin in their blood is not enough to carry oxygen, so they need to yawn to deepen their breathing and prevent their brain from feeling dizzy due to lack of oxygen. Don't think it's a common situation and ignore it.

Although the blood test may not show any problem, frequent yawning is a sign that the kidneys and liver are starting to have problems, and it is important to ** as soon as possible**. If you look at the seller, you will also find that your face is dark, indicating that your body is not oxygenated, which is a bad sign.

Reference: HealthLiving QA BQA 09 The main cause of yawning is the lack of oxygen to the brain. Once the brain is sluggish and wants to sleep when you are tired, yawning can reawaken the sluggish brain.

Yawning, on the other hand, has the effect of deep breathing, which can send oxygen to the brain and body, making the brain awake. The act of yawning is generated by the command of the brain, so it is impossible to stop yawning in the middle of yawning.

Reference: There is not enough oxygen in the brain.

Your brain then signals you to take in more oxygen.

That's when you yawn. So it's not eyebrow tones when you yawn.

It's not dancing.

Instead, there is an inhalation motion: yawning.

People are tired because of a lack of oxygen to the brain. Yawning allows for more oxygen access. Keep your brain awake. This is a conditioned reflex. It may keep people awake when they are not resting.

It's because when we're tired, our brain sends us such a signal, and many people think we're tired.

When the human body is tired, your body will prompt you through the brain, and then make your body tired by yawning constantly, and it is time for you to rest.