The situation of waking up at four o’clock in the middle of the night is not necessarily a bad place, if seen in the elderly, it is in most cases a normal physiological phenomenon, because as people grow older, their sleep time will gradually shorten, and early waking may occur when they sleep too early. In addition to the above, waking up at four o’clock in the middle of the night may also be caused by neurasthenia, which can occur at any age. Patients generally have insomnia and cannot sleep, and even after sleeping with difficulty, they are prone to wake up suddenly during the night, and it is difficult to fall asleep again after waking up, mostly due to mental tension, stress and long-term staying up late. In addition, people who wake up at four o’clock in the middle of the night can be considered to be caused by depression if they are also depressed and have no interest or diminished interest in anything, and in severe cases, patients may have suicidal thoughts or behavior. In traditional Chinese medicine, waking up at four in the middle of the night is also considered a signal of bad lungs, because the corresponding organ from 3:00 a.m. to 5:00 a.m. is the lungs, when the lung meridian is most full of qi and blood, which can perform its own maintenance and upkeep of functions while the body is asleep, and patients with lung diseases often wake up easily from sleep at 4:00 a.m. this time of night, with symptoms such as coughing and shortness of breath.