Try not to turn on the air conditioner when you sleep at night, even if you want to turn it on at the best time, so as to avoid the Yin Qi of air conditioning in the middle of the night and the external cold invading the internal organs, meridians, bones and joints, causing symptoms such as colds, diarrhea, neck, shoulders, lumbocrural pain and joint pain. Don't wear cold clothes such as shorts and vests when you go out in the morning and evening. It is best to take a thin coat or scarf shawl with you in case of the wind.