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Sleet 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 fist drift off into slumber, 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 a bit too, with the alpha rhythm of rather fast waves 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. slower your brain waves will be. Then about 40to 69 minutes after you lose consciousness you will have reached the deepest sleep of all. Your brain 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 period, your body will soon relax again, your breathing 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. |
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shuì mián shì rén měi tiān rì cháng huó dòng xún huán de yī bù fen. rén de shuì mián fēn jǐ gè jiē duàn, ér zhèi xiē jiē duàn yě shì xún huán fā shēng de. rú guǒ nǐ shì yí gè zhèng cháng de shuì mián zhě, nǐ de shuì mián xún huán huì zhè yàng jìn xíng. zài nǐ kāi shǐ hūn hūn rù shuì shí, nǐ de yǎn jīng huì gǔn dòng jǐ xià, tǐ wēn lüè yǒu xià jiàng, jī ròu fàng sōng, hū xī biàn de huǎn màn ér yǒu jié zòu. chú le kāi shǐ jǐ fēn zhōng bǐ jiào kuài de jié zòu wài, nǎo diàn bō yě shāo yǒu jiǎn huǎn. zhè bèi chēng wéi dì yī jiē duàn shuì mián. zài suí hòu yuē bàn xiǎo shí nèi, nǐ jìn yī bù fàng sōng, jìn rù dì èr hé dì sān jiē duàn shuì mián. shuì mián yuè shēn rù, nǎo diàn bō jiù yuè huǎn màn. dà yuē zài kāi shǐ shuì mián hòu de 40 dào 60 fēn zhōng, nǐ jiāng jìn rù chén shuì zhuàng tài. zhè shí de nǎo diàn bō biǎo xiàn wèi jù dà de huǎn bō, bèi chēng wéi jié zòu. zhè jiù shì dì sì jiē duàn shuì mián. dàn nǐ bìng bú shì zhěng yè dōu bǎo chí zhè zhǒng chén shuì zhuàng tài. rù shuì hòu yuē 80 fēn zhōng zuǒ yòu, nǐ de dà nǎo yùn dòng shuǐ píng huì zài dù lüè yǒu tí gāo. jié zòu xiāo shī, bìng bèi nǎo diàn bō de yùn dòng tú xíng qǔ dài. nǐ de yǎn jīng huì zài bì zhe de yǎn jiǎn xià xùn sù zhuàn dòng, jiù hǎo xiàng nǐ zài kàn zhuó yǎn qián fā shēng de shén me shì qíng. zhè zhǒng xùn sù de yǎn qiú yùn dòng chí xù yuē 8 15 fēn zhōng, zhè yī jiē duàn shuì mián bèi chēng zhī wéi kuài sù yǎn dòng REM shuì mián. zài REM shuì mián jiē duàn, nǐ de zhī tǐ huì hěn kuài zài dù fàng sōng, hū xī yě zài cì fàng màn bìng biàn de yǒu jié zòu, nǐ huì qīng sōng dì cóng dì yī jiē duàn huá rù dì sì jiē duàn shuì mián zhí dào dà yuē 80 fēn zhōng hòu chóng xīn jiē jìn qīng xǐng zhuàng tài. |