The ancients said that 3 inches long life, 4 inches worry-free, what size does it mean?

? Three inches long, four inches without worry? That represents the height of the pillow.

As we all know, the comfort and height of pillows have an important influence on the health of human body, especially the spine. The ancients summed up a set of pillow heights in long-term life practice? Law? - ? Three inches long, four inches without worry? .

Inch is an ancient unit of length measurement, and now one inch is about 33 centimeters. Three inches high, equivalent to the current 10 cm. Through scientific research and experiments, it is proved that the pillow with the height of 10 cm is most suitable for people to sleep. Sleeping with a pillow with a height of 10 cm, the brain waves are the most stable and it is easier to enter deep sleep. If the quality of sleep is good, people's life will naturally become longer.

The ancients also said that the height of pillows should never exceed four inches, that is, 13.3 cm. Sleeping on a four-inch pillow is barely enough. There is nothing to worry about. Once you use a pillow more than four inches, it will compress your spine and make it difficult to sleep deeply. The decline of sleep quality will directly lead to the decline of physical function and ultimately affect people's life span.

How did you know this important conclusion in ancient times without instruments and technology? I think it was summed up by the great working people in their long-term practical life. Like many proverbs about the weather, this invention has not been scientifically verified at first, but the correct rate is extremely high and there are few mistakes. For example, if ants move, it will definitely rain; Judge tomorrow's weather by the number of stars at night. These are all summed up by the great working people in their long-term life practice, like? Three inches long, four inches without worry? The same is true for pillow height standards.

It is worth mentioning that the material of ancient pillows is different from our current pillows. Ancient pillows were divided into wooden pillows and porcelain pillows. Porcelain pillows were used by well-off families and landlords, while wooden pillows were used by poor families without money. In other words, ancient pillows were made of hard materials, which is very different from soft pillows now. Compared with ancient pillows, today's pillows are more ergonomic and easier to fall asleep.