Sleep time "Mini Air Cooling Fan" wind should not open too big, in sleep, the body slows down circulation of people, but this time the body most vulnerable when facing the body of excessive wind blowing, it will cause extreme body suited, symptoms of human weakness, and in severe cases a stroke. Should not be long to open "Mini Air Cooling Fan", open "Mini Air Cooling Fan" for 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, it is recommended to open time is about one hour is appropriate.