P2
Sleep is part of a person’s daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If you are an average sleeper, your sleep cycle is as follows . When you first drift off into slumber, your eyes will roll about a bit, your temperature will drop slightly, your muscles will relax, and your breathing will slow and become quite regular. Your brain wavers slow down a bit too, with the alpha rhythm of rather fast waves predominating for the first few minutes. This is called stage 1 sleep. For the next half hour or so, as you relax more and more, you will drift down through stage 2 and stage 3 sleep. The lower your stage of sleep, the slower your brain waves will be. Then, about 40 to 60 minutes after you lose consciousness, you will have reached the deepest sleep of all. Your brain waves will show the large slow waves that are known as the delta rhythm. This is stage 4 sleep.
You do not remain at this deep fourth stage all night long , but instead about 80 minutes after you fall into slumber, your brain activity level will increase again slightly. The delta rhythm will disappear, to be replaced by the activity pattern of brain waves. Your eyes will begin to dart around under your closed eyelids as if you were looking at something occurring in front of you. This period of rapid eye movement lasts for some 8 to 15 minutes and is called REM sleep. It is during REM sleep that most dreams seem to occur. Provided that you do not wake up during the first REM sleep period,your body will soon relax again, your breathing will grow slow and regular once more, and you will slip gently back from stage 1 to stage 4 sleep---only to rise once again to the surface of near consciousness some 80 minutes later.
-------------------------------------------------------------------------
activity : n. 活動,動作,活力
cycle : n. 周期,循環(huán),自行車,一段時間,整套;vi. 循環(huán),輪轉(zhuǎn),騎自行車;vt. 使循環(huán),使輪轉(zhuǎn)
occur : vi. 發(fā)生,想到,存在
average : n. 平均,平均數(shù),海損;a. 一般的,通常的,平均的;vt. 平均為,均分,使平衡;vi. 買進,賣出
drift : n. 漂流物,觀望,漂流;vt. vi. (使)漂流
slumber : n. 睡眠,沉睡狀態(tài);vi. 熟睡,打盹,蜇伏;vt. 睡著渡過(時間)
roll : n. 卷,滾動,名單,壓路機,案卷,翻滾;vi. 滾,滾動,飄流,起伏,繞,卷;vt. 使?jié)L動,卷,繞
slightly : ad. 些微地,苗條地
muscle : n. 肌肉,臂力
relax : vi. 放松,松懈,松弛,變從容,休息,休養(yǎng);vt. 使松馳,緩和,使松懈,使休息
breathing : n. 呼吸,瞬間,微風(fēng);a. 呼吸的,逼真的
alpha : n. 希臘字母的第一個字母,最初,開端
rhythm : n. 旋律,節(jié)奏,韻律,勻稱,節(jié)律
predominate : vt. 掌握,控制,支配;vi. 統(tǒng)治,成為主流
consciousness : n. 意識,知覺,自覺
reach : n. 伸出,延伸,區(qū)域,岬,河段,范圍;vt. 到達,達到,伸出,延伸,影響;vi. 達到,延伸,伸出手,傳開
delta : n. 三角州,希臘字母的第四個字
instead : ad. 改為,抵作,更換,替代
disappear : vi. 消失,不見
pattern : n. 模范,典型,式樣,模式,樣品,格調(diào),圖案;vt. 模仿,仿造,以圖案裝飾;vi. 形成圖案
dart : n. 飛鏢,投射;vt. 投射;vi. 疾走,突進
eyelid : n. 眼皮,眼瞼
rapid : a. 迅速的,飛快的,急促的,險峻的;n. 急流
REM : rapid eye movement
provided : conj. 倘若
gently : ad. 輕輕地,逐漸地
Sleep is part of a person’s daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If you are an average sleeper, your sleep cycle is as follows . When you first drift off into slumber, your eyes will roll about a bit, your temperature will drop slightly, your muscles will relax, and your breathing will slow and become quite regular. Your brain wavers slow down a bit too, with the alpha rhythm of rather fast waves predominating for the first few minutes. This is called stage 1 sleep. For the next half hour or so, as you relax more and more, you will drift down through stage 2 and stage 3 sleep. The lower your stage of sleep, the slower your brain waves will be. Then, about 40 to 60 minutes after you lose consciousness, you will have reached the deepest sleep of all. Your brain waves will show the large slow waves that are known as the delta rhythm. This is stage 4 sleep.
You do not remain at this deep fourth stage all night long , but instead about 80 minutes after you fall into slumber, your brain activity level will increase again slightly. The delta rhythm will disappear, to be replaced by the activity pattern of brain waves. Your eyes will begin to dart around under your closed eyelids as if you were looking at something occurring in front of you. This period of rapid eye movement lasts for some 8 to 15 minutes and is called REM sleep. It is during REM sleep that most dreams seem to occur. Provided that you do not wake up during the first REM sleep period,your body will soon relax again, your breathing will grow slow and regular once more, and you will slip gently back from stage 1 to stage 4 sleep---only to rise once again to the surface of near consciousness some 80 minutes later.
-------------------------------------------------------------------------
activity : n. 活動,動作,活力
cycle : n. 周期,循環(huán),自行車,一段時間,整套;vi. 循環(huán),輪轉(zhuǎn),騎自行車;vt. 使循環(huán),使輪轉(zhuǎn)
occur : vi. 發(fā)生,想到,存在
average : n. 平均,平均數(shù),海損;a. 一般的,通常的,平均的;vt. 平均為,均分,使平衡;vi. 買進,賣出
drift : n. 漂流物,觀望,漂流;vt. vi. (使)漂流
slumber : n. 睡眠,沉睡狀態(tài);vi. 熟睡,打盹,蜇伏;vt. 睡著渡過(時間)
roll : n. 卷,滾動,名單,壓路機,案卷,翻滾;vi. 滾,滾動,飄流,起伏,繞,卷;vt. 使?jié)L動,卷,繞
slightly : ad. 些微地,苗條地
muscle : n. 肌肉,臂力
relax : vi. 放松,松懈,松弛,變從容,休息,休養(yǎng);vt. 使松馳,緩和,使松懈,使休息
breathing : n. 呼吸,瞬間,微風(fēng);a. 呼吸的,逼真的
alpha : n. 希臘字母的第一個字母,最初,開端
rhythm : n. 旋律,節(jié)奏,韻律,勻稱,節(jié)律
predominate : vt. 掌握,控制,支配;vi. 統(tǒng)治,成為主流
consciousness : n. 意識,知覺,自覺
reach : n. 伸出,延伸,區(qū)域,岬,河段,范圍;vt. 到達,達到,伸出,延伸,影響;vi. 達到,延伸,伸出手,傳開
delta : n. 三角州,希臘字母的第四個字
instead : ad. 改為,抵作,更換,替代
disappear : vi. 消失,不見
pattern : n. 模范,典型,式樣,模式,樣品,格調(diào),圖案;vt. 模仿,仿造,以圖案裝飾;vi. 形成圖案
dart : n. 飛鏢,投射;vt. 投射;vi. 疾走,突進
eyelid : n. 眼皮,眼瞼
rapid : a. 迅速的,飛快的,急促的,險峻的;n. 急流
REM : rapid eye movement
provided : conj. 倘若
gently : ad. 輕輕地,逐漸地