Why do you want to sleep from 2: 30 to 3: 00 at noon?

At noon, when the temperature is the highest, the blood vessels on the human body surface are obviously dilated, and a large amount of blood is concentrated on the skin, which leads to the imbalance of blood distribution in the body, especially in the brain. After a morning of study, work and labor, the body consumes more energy, and people will be listless and sleepy. Taking a nap after lunch can effectively compensate the mental and physical consumption of human body, which is of great benefit to health. Therefore, it is very appropriate for people to compare a nap to "healthy charging".

Physiologically speaking, the excited state of human brain cells can generally last for 4-5 hours, and then turn into the inhibited state. Especially after lunch, the blood supply to the digestive tract increased significantly, and the blood supply to the brain decreased significantly. At this time, the body needs a short adjustment to eliminate fatigue, restore physical strength and stabilize the balance of nervous system function.

Modern medical research has proved that sleep is controlled by the internal biological clock. People have two sleep peaks a day. The first peak is the main peak, located at about 2 am, and the second peak is the secondary peak, located at about 2 pm. People don't sleep at the peak of sleep, which is harmful to health. A proper nap can eliminate fatigue and nourish the soul. Instead of resting after fatigue, it is better to take the initiative to rest before fatigue. Relaxing in daily activities and ensuring sleep are good guarantees for good health.

Practice has proved that taking a nap can make up for the lack of sleep at night, make people's brain and body system in a normal and orderly state, and is also a positive measure to prevent heatstroke in summer. Many people, especially mental workers, have realized that work efficiency will be greatly improved after a nap.

A professor at Athens Medical University found that siesta is closely related to the incidence of coronary heart disease. According to the survey, people who can't take a nap because of shift work have a higher risk of coronary heart disease. Taking a nap for half an hour every day can reduce the incidence of coronary heart disease by 20%. In addition, some data show that taking a nap can reduce the occurrence of cerebral hemorrhage.

Napping is really a good habit. Napoleon and Churchill took a nap every day when they were alive. IBM encourages employees to take a nap after lunch, which experts say is an effective way to improve productivity. In Mexico, shops and offices are closed for lunch break. Spain and Greece, members of the European Union, have strict business hours, so people try to take a nap at noon. In the centers of Madrid and Barcelona, nap rooms were set up for those who could not go home to sleep after lunch.

Please pay attention to the following points when taking a nap:

Take a moderate nap, generally not too long, and it is appropriate to take half an hour to an hour. Taking a long nap will make people lazy and brainless, which will affect the quality of sleep at night. American psychologist Mas said: "A 20-minute nap can make up for' lack of sleep'; If it exceeds 60 minutes, it will fall into a deep sleep period that is not easy to wake up and disrupt the physiological clock. When you wake up, you will be groggy and unable to work. "

You can sleep on your back or on your side, but you should not take a nap on your desk. Lying prone or sleeping prone oppresses the chest, affects breathing, makes muscles and nerves unable to relax, and easily leads to insufficient blood supply to the brain. After waking up, there will be dizziness, weakness and other discomfort. Generally speaking, it is better to take a nap in the right lateral position, which can relax muscles, reduce the burden on the heart, increase the blood flow of the liver, and be beneficial to the digestion and emptying of the stomach.

Take a nap. The cold weather turns warm, so I often don't cover myself when I take a nap. After you fall asleep, the cold air will constantly stimulate people's brains and reduce people's immune function. Once bacteria and viruses invade the human body, it will easily lead to headache, dizziness, abdominal pain and diarrhea, numbness of hands and feet, joint pain, mouth and eyes askew and so on. Don't lie in the wind or sleep in front of fans and air conditioners in summer, and don't sleep in the shade or lawn.