The reasons for sleeping up dry mouth are as follows: 1, lifestyle: for example, sleeping at night open air conditioning but no humidification measures, may lead to dry mouth. In addition to the previous night to eat more salty, alcohol, get up at night will also have a dry mouth; 2, disease caused by: in the clinical common diabetes, uremia, diabetic patients due to increased blood glucose leads to increased blood osmolality, there will be thirst, in addition, because of the kidneys urinate, loss of water is more, the body will also be dehydrated, thirst. Uremia patients is due to the lack of some kind of hormone in the body, resulting in water is not able to better reabsorption, in the form of urine a large number of discharges, and ultimately will also lead to patients with dry mouth; 3, snoring: obese patients snoring at night, open-mouth breathing, the water will be lost from the oral mucosa, and waking up at night will feel dry mouth.