Why do people feel irritable and sleepy when it is hot?

Bloom is warm in spring, with pleasant climate and warm weather, but it often makes people feel lazy. Even if they get enough sleep at night, they are still depressed and sleepy during the day. This is what people call "spring sleep". Spring sleepiness is not a disease, but a temporary physiological phenomenon that human physiological function is adjusted with the change of natural seasons and temperature. In winter, in order to adapt to the cold environment, protect the body temperature, prevent the heat from emitting, the skin and tiny blood vessels are in a state of tension and contraction, maintain the physiological constant temperature of the body, and increase the excitement information of the central nervous system, so the human brain is relatively clean. In spring, the temperature is moderate, the skin and muscle microtubules are in a relaxed state, the blood flow is slow, the blood supply to the body surface increases, the blood flowing into the brain decreases correspondingly, and the excitatory stimulation information of the central nervous system weakens, so the phenomenon of "spring sleep" appears. Experts summarized the following six common causes of fatigue: 1. Sleep too much. If you sleep as much as 8- 10 hours every night, you will still feel sleepy and weak after getting up. 2. Partial eclipse You must know that if you eat too much lunch, you will feel sleepy in the afternoon, because the stomach has become the focus and all organs are busy helping it digest food. After smoking, the body stimulates the brain to convey the command to release adrenaline, and the central nervous system is excited, consuming too much glucose in the body, so you feel excited. After this time, you will be more tired, and you will have to pay for the energy you have just consumed excessively. People who don't like sports have weak muscles. 5. People who usually like to take medicine, such as cold medicine, painkillers, antidepressants and anti-anxiety drugs, will cause drowsiness. 6. Insufficient water intake Every organ of the body relies on water to work normally, so if there is water shortage in the body, the metabolic rate will slow down, resulting in a strong sense of drowsiness.