The water molecules in the human body are like a small compass, constantly swinging under the action of the earth's magnetic field lines. When the poles of water molecules are in the same direction as the magnetic field lines between the north and south of the earth, the water molecules stop swinging and tend to be stable; When the polarity orientation of water molecules is different from the magnetic field lines between the north and south of the earth, water molecules will be unstable.
If people's sleeping direction is north-south, then the direction of water molecules, people's sleeping direction and the direction of magnetic lines in the north-south direction of the earth are the same, so people are the easiest to fall asleep and have the highest sleep quality.
Extended data:
The earth itself has a geomagnetic field, and its direction is north-south (South Pole and North Pole). Magnetic field has the property of attracting iron, cobalt and nickel, and the human body contains these three elements, especially a large amount of iron. Choosing the direction of head, north foot and south foot 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 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.
References:
Phoenix. com-Watch your sleeping position