Some diabetic patients may experience elevated blood glucose before dinner, mainly related to the increased secretion of insulin antagonist hormone, resulting in a relative lack of insulin action. There are two peaks of cortisol secretion, one around 8 a.m. and one around 16 p.m. Because of the two peaks of cortisol secretion, this leads to the dawn phenomenon and the dusk phenomenon. The dusk phenomenon is when diabetics experience a rise in blood sugar before dinner. Cortisol is a blood sugar hormone, can antagonize the role of insulin, because diabetic patients insulin secretion ability is limited, poor blood sugar regulation, so the phenomenon of blood sugar before dinner. Diabetic patients who frequently experience this situation are advised to adjust their hypoglycemic drugs under the guidance of a physician.