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托福閱讀：睡眠中呼吸的知識(shí)
時(shí)間：2021-09-09
來源：網(wǎng)絡(luò)
作者：無
你是否睡很久還是很累？或者躺在床上入睡要很久？睡眠問題在這個(gè)年代已經(jīng)成為大家廣泛關(guān)注的問題之一。我們對睡眠的關(guān)注不僅限于睡了多久，做了什么夢，現(xiàn)在的我們更關(guān)注有效睡眠的時(shí)間和質(zhì)量。所以我們有各種設(shè)備，比如智能手表，來監(jiān)測我們的睡眠。但對于睡眠，你真的懂嗎？
科學(xué)研究表示，人類不同年齡的睡眠時(shí)間是不同的。嬰兒的睡眠時(shí)間為20~24小時(shí)，幼兒需要9~12小時(shí)，學(xué)童需要9~10小時(shí)，成人需要7~9小時(shí)，老年人需要6~8小時(shí)，大于80歲的老年人需要9~10小時(shí)。
科學(xué)研究表示，人類不同年齡的睡眠時(shí)間是不同的。嬰兒的睡眠時(shí)間為20~24小時(shí)，幼兒需要9~12小時(shí)，學(xué)童需要9~10小時(shí)，成人需要7~9小時(shí)，老年人需要6~8小時(shí)，大于80歲的老年人需要9~10小時(shí)。
First, there may be a brief cesSATion or reduction of breathing when falling asleep as the sleeper waxes and wanes between sleep and wakefulness and their differing control mechanisms. Second, once sleep is fully obtained, there is an increase of carbon dioxide and a decrease of oxygen in the blood that persists during NREM.
The amount of air exchanged is even lower in REM than NREM because, although breathing is more rapid in REM, it is also more irregular, with brief episodes of shallow breathing or absence of breathing. In addition, breathing during REM depends much more on the action of the diaphragm and much less on rib cage action.
