Fasting blood glucose 3.6mmol/L at 2 o’clock in the middle of the night is generally abnormal and low, and is prone to hypoglycemic reactions. Fasting blood glucose 3.9 to 6.0mmol/L is normal, so fasting blood glucose 3.6mmol/L at 2 o’clock in the middle of the night is abnormal and low. In case of low blood sugar, it is recommended to take sugar water or sugary food immediately, such as chocolate, cookies, candies and so on. If there are serious manifestations such as impaired consciousness and coma, you should seek medical attention and intravenous glucose infusion. Diabetic patients using hypoglycemic drugs can adjust the dosage of the drugs under the guidance of the doctor to help avoid the occurrence of nighttime hypoglycemia. Patients presenting with a fasting blood glucose of 3.6 mmol/L at 2:00 midnight are advised to go to the hospital.