Sleep is the process of physical and mental recovery, however, some people feel dreamy during sleep and feel tired after waking up, or even have nightmares in serious cases, which affects daily life. The reasons for this are mainly the following: psychological factors: excessive psychological burden can also lead to excessive dreaming, such as nervousness before going to bed, worrying about the symptoms of excessive dreaming, etc.; if you are always thinking about something during the day, this thing will also recur during sleep; environmental factors: the sleep process is stimulated by various environmental factors outside the body, such as light, temperature, sound, etc., poor sleep environment or sleep environment changes Physical factors: some discomfort in human waking will be brought to the dream, some diseases can also be reflected in the dream, for example, neurological diseases will often dream of being hit on the head, auditory center lesions will appear in the dream strange sounds, respiratory system diseases often dream of poor breathing, etc.; there are also long-term use of certain drugs can also lead to excessive dreaming. In addition, too full or too hungry before going to bed, daily smoking or drinking a lot of alcohol, drinking coffee, tea or functional drinks, strenuous exercise before going to bed causing mental exhilaration, sleeping too long during the day, etc.; in summary, dreams are physiological phenomena caused by the influence of psychological, physiological, environmental and somatic factors. Sleeping and dreaming all the time is not terrible, dreaming is a part of sleep, keep a calm mind and develop good sleep habits.