"Mini Air Cooling Fan" sleep when the wind should not open too large, during sleep, the body slows down circulation of people, but this time the body is most vulnerable when facing the body of excessive wind blowing, the body can cause extreme adapt, symptoms of fatigue the body, there will be serious stroke. Open fans should not be long, open fan too long, the body will produce discomfort phenomenon. With the large body temperature will reduce the evaporation of sweat and the passage of time, it is easy to cause colds, abdominal pain, diarrhea and other symptoms, should be appropriate to open the recommended open time of 1 hour is appropriate.