關于睡眠的英語作文
睡眠是每個人每天必須經(jīng)歷的生理活動，但親們是否知道睡眠分為幾個不同的層次呢？必克英語整理了一篇有關睡眠的英語作文，睡眠的重要性，睡眠不同階段的特征與童鞋們一起分享！祝大家每天都睡得安穩(wěn)，春節(jié)假期睡個好覺！


關于睡眠的英語作文范文

Sleep is part of a person’s daily activity cycle. There areseveral different stages of sleep, and they too occur in cycles. If you are anaverage sleeper, your sleep cycle is as follows. When you fist drift off intoslumber, your eyes will roll about a bit, you temperature will drop slightly,your muscles will relax, and your breathing well slow and become quite regular.Your brain waves slow and become quite regular. Your brain waves slow down abit too, with the alpha rhythm of rather fast waves 1 sleep. For the next halfhour or so, as you relax more and more, you will drift down through stage 2 andstage 3 sleep. The lower your stage of sleep. slower your brain waves will be.Then about 40to 69 minutes after you lose consciousness you will have reachedthe deepest sleep of all. Your brain will show the large slow waves that areknown as the delta rhythm. This is stage 4 sleep.

You donot remain at this deep fourth stage all night long, but instead about 80minutes after you fall into slumber, your brain activity level will increaseagain slightly. The delta rhythm will disappear, to be replaced by the activitypattern of brain waves. Your eyes will begin to dart around under your closedeyelids as if you were looking at something occurring in front of you. Thisperiod of rapid eye movement lasts for some 8 to 15 minutes and is called REMsleep. It is during REM sleep period, your body will soon relax again, yourbreathing will slip gently back from stage 1 to stage 4 sleep----only to riseonce again to the surface of near consciousness some 80 minutes later.