The air conditioner is adjusted to about 27℃ at night is the most favorable temperature for the human body, because the immunity of the human body will be reduced when it sleeps, so it should not sleep in an environment with too high a temperature, or too low a temperature at this time. If the air conditioning temperature is set too low, the human body will appear wind chill cold situation, if the temperature is set too high will appear dry heat, fire situation. So about 27 ℃ is the most suitable temperature for the human body, in this premise will ensure the overall sleep when the health. However, it is not advocated to sleep in an open air conditioning environment for a long time, it is recommended to set the temperature of the room at 27℃ before sleep, try to open the air conditioning for 3-4 hours, and sleep after closing the air conditioning when the temperature basically continues to balance.