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2. Waking Up Very Thirsty
High blood sugar can make you feel unusually thirsty because the body loses extra fluid through urination. Some people wake up with a dry mouth, sticky feeling in the throat, or a strong need to drink water.
Mayo Clinic describes greater thirst and more urination as important diabetes symptoms. Extra glucose builds up in the blood, and when the kidneys cannot keep up, glucose goes into the urine and pulls fluid from the body.
Thirst alone does not prove high blood sugar. A salty dinner, dry air, mouth breathing, alcohol, or some medications can also cause dry mouth. But thirst that keeps returning at night deserves attention.
3. Restless Sleep or Waking Often