According to clinical evidence, when a person sleeps, the immune system is in a weakened state. At this time, viruses, bacteria and harmful substances are more likely to enter and invade and harm the human body. In addition, when people are resting in bed, especially at night, they have the habit of closing doors and windows, which makes the air in the bedroom relatively closed, and the continuous emission of harmful gases and harmful substances cannot be diffused in time and fully, and its concentration It is often much higher than during the day when the windows are opened for ventilation. These high concentrations of pollutants can cause serious harm to human health. Therefore, it is recommended to move the machine to the bedroom for use at night, so that clean air can accompany you to sleep easily.