Should I close or open the window when I sleep at night?

Open. Sleeping at night without opening the window will reduce the indoor oxygen content, and being in an anoxic environment for a long time will easily lead to brain hypoxia and dizziness. When people are in a state of hypoxia, the quality of sleep will also decline, and in severe cases, breathing difficulties will occur. Choosing to sleep with the window open is beneficial to indoor air circulation. Increasing the oxygen content in the air is beneficial to skin metabolism and delaying skin aging. However, when sleeping, we should pay attention to the decline of human immunity and keep warm when opening the window.

In architecture, a window refers to an opening built on a wall or roof to let light or air into a room. As early as the Sui Dynasty in China, there were windows that could be opened and closed automatically in the Guanwen Temple in the Wei Zi Palace.

In fact, the original meaning of window and door refers to window and door respectively, while in modern Chinese, window only refers to window. "Window" was originally called "chimney" ("chimney" is a common word), that is, a hole is left in the wall, and the window lattice in the frame can transmit light or smoke, and the prefix "hole" is added to form pictophonetic characters. Shuowen said: "Those who go up the wall are called it, and those who go up to the temple are called it". Windows, or through holes. "The window frame is responsible for supporting the main structure of the window. The material can be wood, metal, ceramic or plastic, and the transparent part is attached to the window frame. The material can be paper, cloth, silk or glass.