There are many reasons for frequent nightmares, science believes that dreams are very necessary and important, nightmares are not terrible, beautiful dreams do not always come true, nightmares are even more so, must be open to it. The common reasons for frequent nightmares are the following: 1, environmental factors: some environmental factors will directly affect the sleep situation, such as room temperature, poor sleep environment, sleep posture error, winter cover too thick, etc. causing discomfort; daytime exposure to too many stimulating things, etc., may cause abnormal brain excitement, often nightmares; 2, psychological factors: such as work pressure, thinking about the problem will lead to psychological 2, psychological factors: such as work pressure, thinking about the problem will lead to long-term depression, certain people who have experienced major trauma and change is also the case, the dream is a special performance of the body’s internal mental activity; 3, physical factors: such as a long time dream to a part of the disease related to clinical performance, the part of the health situation may be a problem, such as kidney disease patients dream of drowning, respiratory disease patients dream of fire smoke, etc.. In short, dream is a normal physiological phenomenon, sleep will dream, as long as it does not affect the daytime life and work, even every night dream is normal. There is no need to pay too much attention to nightmares.