The manifestations of severe insomnia are mainly the following: 1. Patients have insomnia for a long time, which may be months or years. 2. Patients may show serious difficulty in falling asleep, and many patients will fall asleep only after 1-2 hours of lying in bed. 3. The patient’s total sleep duration is reduced, and some patients may feel that the sleep duration is about 1-2 hours per night, resulting in a more depressed mental state during the day, accompanied by dizziness, dullness, lack of concentration, and memory loss, and other signs of brain nerve dysfunction.