Insomnia can cause increased blood sugar, especially long-term insomnia. Clinically, long-term insomnia can lead to endocrine disorders in some patients. Due to endocrine disorders, patients can develop metabolic syndrome, which manifests as high blood sugar, high blood lipids and high blood pressure, so long-term insomnia can lead to increased blood sugar. For early patients can appear abnormalities of glucose tolerance, but it is not diagnosed as diabetes. Patients are advised to adjust their sleep, and at the same time to strengthen physical exercise to improve the three highs caused by metabolic syndrome. If patients are diagnosed with diabetes, they should actively control their diet and strengthen exercise while actively regulating blood sugar with hypoglycemic drugs to avoid the increase of blood sugar leading to cerebral arteriosclerosis which affects the function of endocrine and makes patients develop cerebrovascular diseases, etc. For patients with insomnia, it is recommended to develop a good work and rest schedule and have appropriate physical exercise after dinner. It can not only adjust insomnia, but also lower blood sugar.