The fear of insomnia once the night comes is the process of forming a vicious chain reaction of insomnia. The patient forms an unreasonable perception of sleep when he or she experiences the first time difficulty in falling asleep, excessive dreaming, early waking, or the inability to fall back asleep after waking, discomfort after waking, fatigue, and sleepiness the next day. In other words, patients may adjust their sleep by making up for the poor sleep yesterday, which is harmful to good sleep habits. As a result, the patient is worried about losing sleep again the next day, so he or she may experience mood changes, anxiety, irritability, frustration, and so on. A chain reaction is then formed, with insomnia leading to worry, tension, and fear causing anxiety reactions, which eventually provide the psychological basis for insomnia again. By constantly and repeatedly reinforcing this repeated fear, the symptoms of insomnia are gradually nurtured, so when this occurs, psychotherapy becomes an effective treatment method. The psychological effects associated with insomnia are subdued by helping the patient to recognize their interlocking vicious cycle of cognition. Alternatively, sedative-hypnotic drugs can be applied to adjust sleep and further assist psychotherapy to get effective improvement.