最近美国科学家发表了一项研究，结果显示只有在进入深度睡眠时，大脑中的血液才会退出，让脑脊液进入并清洗大脑中的污染物和垃圾。
这样第二天睡醒后大脑会变得清新、充满能量。
所以为了让我们保持大脑的最佳状态，我们要注意以下几点。
第一，要保持睡眠充足，无论是晚上睡觉还是白天睡觉，一般为6到7小时。
其次，要保证睡眠质量，只有好的睡眠才能促进大脑中血液的退出和脑脊液的进入，以清洗大脑。
当然，好的睡眠质量也应遵循生物钟规律，也就是夜晚睡觉，白天工作。
最后，要想让脑脊液彻底清除大脑中的污染物，应尽量采用侧卧的姿势睡觉。
Hover a word for its pinyin & meaning; click to pin it.
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| Chinese | Pinyin | English |
|---|---|---|
| 最近 | zuì jìn | recently |
| 美国 | Měi guó | United States; USA; US |
| 科学家 | kē xué jiā | scientist |
| 发表 | fā biǎo | to issue / to publish |
| 了 | le | (completed action marker) / (modal particle indicating change of state, situation now) |
| 一 | yī | one / single / a (article) |
| 项 | xiàng | classifier for principles, items, clauses, tasks, research projects etc |
| 研究 | yán jiū | research / a study |
| 结果 | jié guǒ | outcome; result; consequence |
| 显示 | xiǎn shì | to show / to illustrate / to display / to demonstrate |
| 只有 | zhǐ yǒu | (只有……才……) it is only if ... (that one can ...) / it is only (someone) who ... |
| 在 | zài | (used before a verb to indicate an action in progress) |
| 进入 | jìn rù | to enter / to join / to go into |
| 深度 | shēn dù | depth / (of a speech etc) profundity / advanced stage of development |
| 睡眠 | shuì mián | sleep |
| 时 | shí | when |
| 大脑 | dà nǎo | brain / cerebrum |
| 中 | zhōng | within; among; in |
| 的 | de | possessive particle (of; 's) / modifying particle (used after an attribute to modify a noun or to form a nominal expression) |
| 血液 | xuè yè | blood / (fig.) lifeblood |
| 才 | cái | then and only then |
| 会 | huì | to be likely to; to be sure to |
| 退出 | tuì chū | to withdraw / to abort / to quit / to log out (computing) |
| 让 | ràng | to permit / to let sb do sth / to have sb do sth / to make sb (feel sad etc) |
| 脑脊液 | nǎo jǐ yè | cerebrospinal fluid (CSF) |
| 并 | bìng | furthermore / also / simultaneously |
| 清洗 | qīng xǐ | to wash; to rinse; to clean / (fig.) to purge; to get rid of (corrupt individuals etc) |
| 污染 | wū rǎn | (lit. and fig.) to pollute; to contaminate |
| 物 | wù | (bound form) thing / (literary) the outside world as distinct from oneself; people other than oneself |
| 和 | hé | and; together with |
| 垃圾 | lā jī | trash / refuse / garbage |
| 这样 | zhè yàng | this way; like this; so |
| 第 | dì | (prefix indicating ordinal number) |
| 二 | èr | two / 2 |
| 天 | tiān | day |
| 睡 | shuì | to sleep / to lie down |
| 醒 | xǐng | to wake up / to be awake / to become aware / to sober up / to come to |
| 后 | hòu | afterwards / after |
| 变得 | biàn de | to become |
| 清新 | qīng xīn | fresh and clean |
| 充满 | chōng mǎn | full of / brimming with / very full / permeated |
| 能量 | néng liàng | energy / capabilities |
| 所以 | suǒ yǐ | therefore / as a result / so |
| 为了 | wèi le | for; for the purpose of; in order to |
| 我们 | wǒ men | we; us; ourselves; our |
| 保持 | bǎo chí | to keep / to maintain / to hold / to preserve |
| 最 | zuì | (before an adjective or verb) to the highest degree; (the) most ...; -est |
| 佳 | jiā | beautiful / fine / good |
| 状态 | zhuàng tài | condition; state; state of affairs |
| 要 | yào | will; shall; about to / need to; should / if |
| 注意 | zhù yì | to take note of; to pay attention to |
| 以下 | yǐ xià | the following |
| 几 | jǐ | several / a few |
| 点 | diǎn | point; dot; spot; speck / dot stroke in Chinese characters / (math.) decimal point / point in time or space / (after a number) o'clock |
| 充足 | chōng zú | adequate / sufficient / abundant |
| 无论 | wú lùn | no matter what or how / regardless of whether... |
| 是 | shì | to be (followed by substantives only) |
| 晚上 | wǎn shang | in the evening |
| 睡觉 | shuì jiào | to go to bed / to sleep |
| 还是 | hái shi | or |
| 白天 | bái tiān | during the day |
| 一般 | yī bān | generally / in general |
| 为 | wéi | to take sth as / to act as / to serve as / to behave as / to become / to be / to do |
| 到 | dào | to reach; to arrive / to (a place); until (a time); up to (a point) / (verb complement indicating arriving at a place or reaching a point) |
| 小时 | xiǎo shí | hour |
| 其次 | qí cì | next / secondly |
| 保证 | bǎo zhèng | to guarantee / to ensure / to safeguard / to pledge |
| 质量 | zhì liàng | quality / quality and quantity |
| 好 | hǎo | good / appropriate; proper |
| 能 | néng | can / to be able to / might possibly |
| 促进 | cù jìn | to promote (an idea or cause); to advance; boost |
| 以 | yǐ | by means of / according to / in order to / because of / at |
| 当然 | dāng rán | certainly / of course / without doubt |
| 也 | yě | also; too; as well; (not ...) either |
| 应 | yīng | should / ought to / must / (legal) shall |
| 遵循 | zūn xún | to follow; to abide by; to comply with |
| 生物钟 | shēng wù zhōng | biological clock |
| 规律 | guī lǜ | rule / law of behavior / regular pattern / rhythm / discipline |
| 就 | jiù | merely; nothing else but; simply; just; precisely; exactly |
| 夜晚 | yè wǎn | night |
| 工作 | gōng zuò | to work / (of a machine) to operate |
| 最后 | zuì hòu | finally; in the end |
| 想 | xiǎng | to desire; to want (to) |
| 彻底 | chè dǐ | thoroughly |
| 清除 | qīng chú | to clear away / to eliminate / to get rid of |
| 尽量 | jǐn liàng | as much as possible |
| 采用 | cǎi yòng | to adopt / to employ / to use |
| 侧 | cè | the side / side |
| 卧 | wò | to lie / to crouch |
| 姿势 | zī shì | posture / position |