英语作文梦里作文

dreams are successions of images,ideas,emotions,and sensations that occur involuntarily in the mind during certain stages of sleep.the content and purpose of dreams are not definitively understood,though they h**e been a topic of scientific speculation,as well as a subject of philosophical and religious interest,throughout recorded h**tory.the scientific study of dreams ** called oneirology.
dreams mainly occur in the rapid-eye movement (rem) stage of sleep—when brain activity ** high and resembles that of being awake.rem sleep ** revealed by continuous movements of the eyes during sleep.at times,dreams may occur during other stages of sleep.however,these dreams tend to be much less vivid or memorable.
dreams can last for a few seconds,or as long as twenty minutes.people are more likely to remember the dream if they are awakened during the rem phase.the **erage person has about 3 to 5 dreams per night,but some may h**e up to 7 dreams in one night.the dreams tend to last longer as the night progresses.during a full 8-hour night sleep,two hours of it ** spent dreaming.