What causes frequent nightmares?

Frequent nightmares may be caused by various factors. 1) Excessive psychological stress, such as tension and anxiety related to work, study, or interpersonal relationships, can manifest as nightmares during sleep. 2) Unhealthy lifestyle habits, such as consuming too much caffeine or stimulating foods in the evening, may also reduce sleep quality and increase the frequency of nightmares. Additionally, one's psychological state, including feelings of depression or anxiety, can emerge in dreams as nightmares. At the same time, physical illnesses or discomfort may affect sleep quality and thereby trigger nightmares. To alleviate this condition, it is recommended to maintain healthy lifestyle habits, reduce psychological stress, and cultivate a positive mindset.