Waking up at 3 o’clock in the morning and not being able to sleep may be caused by a variety of factors. If the symptoms are occasional, they are mostly seen in physiological reasons, namely personal sleep habits, as the patients themselves sleep earlier, going to bed at 8-9 o’clock at night, which may lead to waking up at 3 o’clock in the morning, because at this time 7-8 hours of sleep have been reached. Secondly, it is also possible to consider things too much or mental tension and stress during the day, which leads to sleeplessness at 3 o’clock in the morning, and all of the above are normal phenomena. In addition, it may also be caused by pathological factors, commonly including early awakening, depression, etc. 1. Early awakening: If you frequently or have been waking up at 3 a.m. and can not sleep, it is considered a pathological sleep rhythm change, called early awakening, a kind of sleep disorder, which is manifested by waking up earlier than the wake time of their own sleep pattern and can not fall back to sleep, mostly seen in mental weakness or depression and other diseases; 2. Depression: depressed patients’ sleep disorder is mainly manifested as early awakening, and they cannot fall asleep again after waking up, and it can be accompanied by significant and persistent emotional depression, depression and pessimism, and in serious cases, it can produce light thoughts; 3, other: some patients with organic diseases, such as sleep apnea syndrome, chronic obstructive pulmonary disease, coronary heart disease, heart failure, gastroesophageal reflux and other diseases may wake up early due to choking sensation, angina pectoris, gastrointestinal vomiting If patients wake up early due to discomfort such as angina pectoris, gastrointestinal vomiting, etc., they need to actively treat the original disease to improve the symptoms of early waking.