When did China start to have a bed for sleeping in the modern sense?

In ancient times, a bed was not only a place to rest, but also a simple seat. In Shuowen, there is "a bed and a place to sit." "

Before the Northern and Southern Dynasties, the so-called bed was not a real bed.

The bed was introduced by Hu people, called Hu bed. Hu people have really changed the traditional lifestyle of Han people sitting on the floor.

According to the Book of Rites, the mattress on which Ceng Zi died when he died was not in conformity with the regulations. Visible at that time. Bed has always been valued by the ancients.

In primitive society, people lived a simple life and slept only to spread plant branches or animal skins. After mastering the knitting technology, they laid a summer mat. After the mat appeared, the bed appeared. There is a bed-shaped word "Lin" in Oracle Bone Inscriptions in Shang Dynasty, which indicates that there is a bed in Shang Dynasty. But from the physical point of view, the earliest bed was found in a large Chu tomb in Changtaiguan, Xinyang. It was carved with exquisite patterns, surrounded by railings, and had six short feet below, only 19 cm high. Since the Spring and Autumn Period, beds often double as other furniture. People write, read and eat in bed. The bed painted by Gu Kaizhi, a famous painter in the Jin Dynasty, is almost as high as today's bed. In addition, there is a four-legged high bed. But the bed has not yet become a special furniture for sleeping. After the appearance of tables and chairs in the Tang Dynasty, people lived and ate on the tables and no longer moved on the beds. Bed is a kind of multifunctional furniture, which has become a special item for sleeping. The spring bed appeared in 19 years. /kloc-In the late 20th century, metal beds began to appear.