Duke Zhou, someone took me down the ladder.

Scientists have carefully studied the relationship between dreams and sleep and found that dreams mainly occur in active sleep. What is rapid eye movement sleep? This is a shallow sleep state that occurs in the late stage of sleep, characterized by rapid eye movement, accelerated breathing and heartbeat, and temporary limb paralysis. If a person wakes up directly from REM sleep (for example, by an alarm clock), he is probably dreaming a vivid dream. Wake up children or adults in rem sleep, and about 60 ~ 90% of them complain that they are dreaming before waking up. The changes of organ function during REM sleep cycle indicate that REM sleep has a certain physiological relationship with dreams, or that active sleep has more psychological and physiological basis for dreams. Dreams may also occur during other sleep periods, but they are rare and vague. Hope to adopt, thank you.