Dreaming is a normal physiological phenomenon, and everyone dreams whenever they sleep. Some people feel that they did not dream at all all during the night, but in fact they did not remember; some people feel that they have been dreaming all night and even woke up with fright, that is, they were awakened by nightmares. This situation will not only make people highly fearful in the long run, but will also affect subsequent sleep, and the dreams will continue to haunt the dreamer. So what is the reason for waking up with nightmares, mainly the following aspects: 1, psychological factors: dream is a special performance of the human body in the divine activity, it is often said that “the day has a thought, the night has a dream”, work pressure, thinking about the problem, or their career in trouble, will lead to long-term psychological depression, tension. Research has proved that psycho-psychological factors can account for 60% of the direct causes of nightmares, those who wake up dreams are mostly caused by depression, anxiety, fear, negative psychology, some people who have been stimulated or traumatized by the spirit will also be awakened by nightmares for a long time. 2, physical factors: certain physical diseases can also cause nightmares, resulting in sleep disruption. Some can also be caused by disease, such as heart disease, Parkinson’s disease, sleep apnea and mental illness, in the frequent nightmares woke up most of the patients with chest tightness and arrhythmia; some long-term dream of drowning or choking and wake up may have sleep apnea syndrome; frequent nightmares or frequent waking children are more prone to mental illness; often take certain drugs and drug users will also Some people believe that kidney deficiency and fear are also prone to nightmares. In short, there are many reasons for waking up with nightmares, generally speaking, nightmares do not require targeted treatment, but if you are woken up with nightmares for a long time to bother normal life, you should go to the hospital to identify the cause and deal with it. Before treatment, we must first relieve psychological pressure, improve the ability to withstand, and develop good sleep habits.