Scientific research shows that people should sleep with their heads facing north and their feet facing south. This is because the earth itself has a geomagnetic field, and the direction of the geomagnetic field is north-south (divided into South Pole and North Pole). Magnetic field has the property of attracting iron, cobalt and nickel. The human body contains these three elements, especially the blood contains a lot of iron (in hemoglobin of red blood cells). Choosing the direction of head north and feet south to sleep can conform to the magnetic field lines, let the magnetic field lines pass through the human body smoothly, minimize the interference of geomagnetic field to the human body, and make sleep sweeter. Chinese medicine also believes that people should sleep in the north-south direction, with their heads facing north and their feet facing south. The explanation is that taking this sleeping direction, the running direction of qi and blood in human body is consistent with the direction of the earth's magnetic field lines (that is, the arrangement of biomolecules in human body will change from disorderly direction to directional arrangement), which is easy to make qi and blood smooth, reduce metabolic rate and energy consumption, and naturally feel refreshed when you wake up. Sleeping with head facing north and feet facing south virtually requires us to put the bed in the bedroom facing north and south, and try not to face east and west. This is because the east-west direction of the bed will directly lead to the east-west direction when people sleep, and it is easy to change the distribution of blood in the human body, especially in the brain, thus causing insomnia or dreaminess and reducing the quality of sleep. Many ancient and modern medical scientists believe that lying on the right side and slightly bending the body is the best sleeping position, regardless of men, women and children. This is mainly due to human physiological structure. The human heart is located on the left side of the chest, the openings of the gastrointestinal tract are all on the right side, and the liver is also on the right side. If you lie on your side, you can relieve the pressure on your heart. If the pressure on the heart is small, it is beneficial to the pumping of blood and increase the blood supply flow of organs such as stomach and liver. At the same time, when you lie on your right side, things in your stomach will easily flow into the duodenum and small intestine, which is beneficial to the digestion and absorption of food and the metabolism of the human body. In addition, sleeping in this posture can relax the muscles of the whole body during sleep, ensure smooth breathing and minimize the physiological activities of the heart, lungs and gastrointestinal tract. Because the heart is not oppressed and the lungs breathe freely, it can ensure the oxygen supply needed by the whole body during sleep, so that the brain can get a full rest and improve the quality of sleep. Other sleeping positions have some shortcomings. When lying on your back, the base of your tongue falls backwards, which is easy to snore because of poor breathing. After sleeping soundly, it is easy to put your hand on your chest and press your heart, which leads to nightmares and makes people sleep very tired. When lying prone, the chest and abdomen are compressed, and the mouth and nose are easily covered by pillows, which is easy to cause "stiff neck"; When lying on the left side, the apex of the heart is easy to be compressed, and the ear can hear the heart sound when sticking to the pillow, which affects sleep and will lead to neurasthenia and cardiovascular disease over time. For most healthy people, there is no need to care too much about their sleeping position. This is because in a night's sleep, the human body will turn over many times, and it is impossible for people to stay in the same sleeping position until dawn. Our bodies are very clever. In order to relieve fatigue and restore physical strength, people always unconsciously change their sleeping positions when sleeping. For people with certain diseases, it is necessary to pay attention to their sleeping posture, and it is not necessary to mechanically force them to lie on their right side. Taking some protective sleeping positions by yourself is conducive to preventing the occurrence of diseases or alleviating the symptoms of diseases. You know, many diseases are induced or aggravated by improper sleeping posture.