Postprandial blood glucose is not high while fasting blood glucose is high, it may be Sumuje phenomenon or dawn phenomenon. If it is Sumuji phenomenon, the dose of hypoglycemic drugs before bedtime should be reduced or meals should be added appropriately. If it is a dawn phenomenon, the dose of hypoglycemic drugs can be increased appropriately, and the amount of food at dinner or late-night snacks can be reduced. Postprandial blood glucose is not high but fasting blood glucose is high, first of all, the cause of high fasting blood glucose should be clarified, usually for the Sumuje phenomenon and dawn phenomenon, which can be clarified through the detection of nighttime blood glucose. If hypoglycemia occurs at night, it is called Sumuje phenomenon, and if no hypoglycemia occurs at night, it is called Dawn phenomenon. 1. Sumuje phenomenon: The low blood glucose value at night is a response to hypoglycemia at night, which leads to a rebound increase in fasting blood glucose in the early morning. Therefore, the dose of hypoglycemic drugs before bedtime should be adjusted or meals should be added appropriately. 2. Dawn phenomenon: no hypoglycemia occurs at night. It may be due to the early morning cortisol hormone, growth hormone, dopamine and other glycemic hormones released into the blood due to the excessive release of fasting blood glucose. At this time, you can appropriately increase the dose of hypoglycemic drugs, reduce the amount of food for dinner or late-night snacks. It is recommended that patients seek timely medical attention to clarify the cause of high fasting blood glucose, and under the guidance of the doctor for treatment.