There are several reasons for frequent thirst in the middle of the night: 1. changes in weather and diet, such as dry weather in autumn and hot weather in summer, causing fast loss of body fluids, in addition to dietary habits, eating too salty, drinking too much alcohol before bed, can cause thirst at night, it is recommended that the daily situation can be increased according to the appropriate amount of water, in the diet pay attention to keep light, less alcohol, etc. 2. often appear at night If you are thirsty at night, you need to be alert to the possibility of endocrine diseases and diabetes, because diabetes can cause the body to be in a state of high sugar, it will show the symptoms of thirst and excessive drinking, you need to go to the hospital to do oral glucose tolerance test to rule out the possibility of diabetes.