This is because the earth itself has a geomagnetic field, and the direction of the geomagnetic field is north-south (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. Choosing the head, north foot and south direction to sleep can conform to the magnetic field lines, make the magnetic field lines pass through the human body smoothly, minimize the interference of geomagnetic field to the human body, and make sleep more sweet.
Chinese medicine also believes that people should sleep with their heads facing north and their feet facing south. The explanation is that with this sleeping orientation, the direction of qi and blood in the human body is consistent with the direction of the earth's magnetic field lines, which is easy to make qi and blood smooth, reduce metabolic rate and reduce energy consumption, and naturally feel refreshed when you wake up.
Extended data:
The east is the direction in which the sun rises, so sleeping in the east can make people get up early because of the solar magnetic field. The ancients said that a day's plan lies in the morning. If you want to live a full and busy life every day, the East is the most suitable choice. You must know how the house where you live and the bedside are arranged.
There is a taboo in geomantic omen: usually you can't sleep with your head in the west. We think the west is a lazy direction. If you really have no choice but to lie facing west, don't use gray or charcoal sheets unless your numerology and five elements like it. So girlfriends who don't know which direction to sleep can avoid it.
For some female friends, lying with head facing north can relieve insomnia symptoms, but it is also easy to make people feel depressed. The above-mentioned "the bed of the dead faces north" is just a folk saying, because it is related to the dead, so it is considered unlucky.
In addition, the northwest direction is Ganbu, and Feng Shui is considered to be the most conducive direction for sleeping, so it is very suitable for the elderly, family elders and men.
Sleeping with your head facing south is easy to make people excited and cause insomnia. So, try to avoid facing south.
References:
People's Network-Tips of Traditional Chinese Medicine: Which direction to sleep longer?