Why is it easier to get sleepy when the weather is hot?

"Spring is sleepy and autumn is short of summer sleep" and "summer sleep" is also called "summer fatigue" in medicine. It is because after the temperature rises in summer, people's skin blood vessels and pores expand, the diameter of blood vessels increases, the blood flow of the skin increases greatly, and the blood supply to the brain will decrease relatively, and the brain will automatically make protective adjustments to reduce the excitement, so people will feel sleepy because of the self-inhibition of brain tissue.

On the other hand, in summer, the metabolism of human body is accelerated and the oxygen consumption is increased, so the brain can't adjust its dependence on oxygen for a while. Causes the human body to be unable to adapt to the environment for a while, feeling sleepy and tired.

Chinese medicine believes that it is easy to doze off in summer, which is related to the climate characteristics. Traditional Chinese medicine believes that the rainy season is a long summer and a "wet" season, and "dampness evil" is a disease that makes people feel spleen deficiency and dampness resistance, dizziness and fatigue, loss of appetite, and easy to get tired and sleepy.

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