After recovering from hyperglycemia, insomnia and dreaminess are considered to be caused by physiological factors, nocturnal hypoglycemic episodes and other diseases. 1. Physiological factors: After diagnosis of high blood sugar, life-long treatment is usually needed to cure it, which may bring some psychological pressure to the patient and cause anxiety and depression; the sleeping environment is too noisy, too cold or too hot; and coffee and other beverages are consumed before going to bed; the above mentioned factors can cause insomnia and excessive dreams. 2. Nocturnal hypoglycemic attack: patients with high blood sugar may cause nocturnal hypoglycemic attack if the dose of medication is too much or too little, which may also cause insomnia and excessive dreaming. 3. Other factors: hyperthyroidism, plant nerve disorders, etc. can cause insomnia. After excluding physiological factors, it is recommended that patients with high blood sugar suffer from insomnia and sleeplessness to go to the hospital and ask the doctor to make a judgment.