The causes of dry throat while sleeping include inflammatory reaction, open mouth breathing while sleeping and diabetes, as follows: 1. Inflammatory reaction: This condition may be caused by inflammatory reaction, such as chronic pharyngitis, chronic tonsillitis. 2. Open mouth breathing while sleeping: Some patients are caused by snoring while sleeping and open mouth breathing, because after open mouth breathing, the outside air will directly stimulate the pharynx 3, diabetes: some patients are also due to diabetes, poor blood sugar control caused. There are individual differences in the specific causes and severity of the disease. After the onset of the disease, it is recommended to visit the ENT department, where routine blood tests and laryngoscopy can be done to help determine the condition and make a clear diagnosis. After the diagnosis is made, targeted treatment can be carried out. In daily life, drinking more warm water can also help improve the symptoms.