Dreams are a normal physiological phenomenon, a subconscious expression of emotions, so the cause of daily dreaming is also a variety of internal and external stimuli and the residual external stimuli during the day. As the saying goes, “If you think about something during the day, you dream about it at night”. If you think about something during the day, it will recur during sleep; scientists have found that dreams often reproduce daytime experiences. Almost all dreams are related to people’s daily work, wishes, imagination, memories, worries, thoughts, worries and other mental activities. In addition, excessive psychological burden can also lead to excessive dreaming, such as a nervous state of mind before bedtime and worrying about symptoms of excessive dreaming; lifestyle habits can also have an impact on sleep. The poor sleep environment or the change of sleep environment may lead to unrealistic sleep, and the stimulation of various environmental factors outside the body during sleep, such as light, temperature, sound, etc.; some discomfort of human waking can be brought to the dream, and some diseases can be reflected in the dream. Some diseases can be reflected in dreams, for example, neurological diseases will often dream of being hit on the head, auditory center lesions will appear strange sounds in dreams, respiratory system diseases often dream of poor breathing, etc.; and long-term use of certain drugs can also lead to excessive dreams. In summary, if you dream every day and affect the quality of sleep, you need to make timely adjustments to improve sleep by reducing the stimulation caused to the brain during sleep and during the day.