Usually, diabetic patients tend to have elevated blood glucose at dawn and in the evening, the former phenomenon is called the “dawn phenomenon” of diabetes and the latter phenomenon is called the “dusk phenomenon” of diabetes. In fact, the mechanism of these two phenomena is the same, both of them are related to the uncoordinated secretion of insulin and gluconeogenic hormones (growth hormone, adrenocorticotropic hormone, catecholamines and glucagon) in the body of diabetic patients within 24 hours. Under normal circumstances, the secretion of glucagon-producing hormones in the human body gradually increases from zero to 4-6 am, then gradually decreases, and another peak of glucagon-producing hormone secretion will be ushered in at 5-7 pm. In normal people, basal insulin secretion will increase with the increase of gluconeogenic hormone in their bodies, and there will be two peaks, thus ensuring that their blood sugar is maintained at a normal level. In contrast, diabetic patients cannot effectively counteract the glucose-raising effect of glucagon-producing hormone due to insufficient secretion of basal insulin in their bodies, and thus are prone to the “dawn phenomenon” or “twilight phenomenon” of diabetes. Both of these phenomena are caused by insufficient dosage of glucose-lowering drugs or insulin, and the medication regimen must be adjusted. Combined with the theory of Chinese medicine time medicine, try to take Chinese medicine to supplement Yin at night before going to bed and early in the morning around 5-6 o’clock, which has certain effect on the prevention and control of this phenomenon.