Sudden dizziness and sweating while sleeping may be hypoglycemia, and blood sugar should be monitored. If the patient’s blood sugar decreases, palpitations, chest tightness and shortness of breath may occur at the same time. If the blood sugar is lower than 3.9mmol/L, it is called hypoglycemia and should be corrected in time. You can take oral sugar saline, sugar cubes, or oral chocolate or dessert, or in severe cases, intravenous hypertonic glucose is pushed to correct hypoglycemia quickly. Severe hypoglycemia may cause hypoglycemic encephalopathy and irreversible damage of neurological function, even causing life threatening, and should be corrected in time. If the patient’s blood sugar is lowered is mostly seen in weak people, and if there is diabetes, irregular diet during the application of hypoglycemic drugs may also cause it.