The essence of dawn phenomenon is the rise of blood sugar caused by the release of morning glucagon such as ACTH and growth hormone, which is a normal physiological phenomenon. Patients show that after a night of sleep, without eating, morning blood sugar is higher than bedtime blood sugar, which causes a certain degree of psychological stress to patients and increases the difficulty of postprandial blood sugar control with the rise of fasting blood sugar. Therefore, you can consider using with long-acting insulin or with long-acting drugs that stimulate insulin release, or metformin to solve the dawn phenomenon.