What if the bed is too hard in summer?

You can buy a mattress and put it on the bed. If it is too hot in summer, you can buy a water mattress, which is comfortable and cool, especially good, and especially comfortable to lie down.

A bed is a good thing. Humans didn't always have soft beds in the process of evolution, but Simmons did, so it's better for humans to sleep in hard beds, which is conducive to relaxing the muscles in their backs.

A bed is furniture for people to lie on and sleep on. People spend one third of their time in bed. After thousands of years of evolution, it is not only a tool for sleeping, but also one of the decorations in the family. The types of beds are flat bed, four-poster bed, bunk bed, day bed and so on.