What is the reason for blood sugar before bed being higher than blood sugar after meals?

First of all, we know that high blood sugar refers to blood sugar greater than 7.1ml/L before meals and blood sugar greater than 11.1ml/L 2 hours after meals, which is called hyperglycemia. The general increase in blood sugar includes fasting blood sugar, blood sugar 2 hours after meals, and monitoring of blood sugar before bedtime. Sometimes our postprandial blood sugar is not very high, because after we apply hypoglycemic drugs, we can reduce postprandial blood sugar, but the human body still has normal metabolism. Therefore, when we measure blood sugar before bedtime, it may be higher than postprandial blood sugar, mainly because after the drug is released, there will still be some residual calories in our body. Therefore, monitoring blood sugar before bedtime is higher than this postprandial blood sugar. At this time, insulin can be given before dinner or 22 o 'clock in the evening. After a period of time, insulin can also stimulate our islet secretion function.