2. Green plants: Green plants can purify the air, increase oxygen content and relieve tension, but at night, the respiratory function of green plants will inhale oxygen and release carbon dioxide, which will easily make people stay in an anoxic environment for a long time and make it difficult to enter deep sleep, leading to continuous fatigue. In addition, a large number of molds may be hidden in the soil, which may cause respiratory diseases such as allergies or asthma. If you need green plants for decoration, you can place a small number of hydroponic plants, such as Fu Guizhu or cactus plants.