There are many reasons for frequent nightmares, including environmental factors, psychological factors, physiological factors and somatic factors, which are the result of multiple influences. Specifically: psychological factors: Dreams are a special manifestation of the body’s internal mental activity, as is often said, “there is something to think about, there is a dream at night”, work pressure, thinking about the problem will lead to long-term psychological depression, certain people who have experienced major trauma and changes are more obvious; external environmental factors: some factors will directly affect sleep, such as Room temperature discomfort, light stimulation, sleep posture error, winter covers too thick, etc., causing physical discomfort; daytime exposure to too many stimulating things cause abnormal brain excitement, such as watching horror movies and novels, etc.; physiological factors: according to the survey, women have more nightmares than men, consider the reason is that women feel more strongly about nightmares, and women are more likely to bring anxiety to sleep; children are more likely to have nightmares than adults, the reason For the brain is not fully developed, the emotions are easily affected by the outside world; somatic factors: relevant studies have confirmed that frequent nightmares can indicate certain diseases, such as a long time dream of a part of the disease related to clinical manifestations, may be the health of the part of the problem, but is not certain, further examination is needed. In short, frequent nightmares do not be afraid, to adjust the mindset, find the root cause and solve, so as to have a good sleep.