很多人認爲只有在安靜的環境下才能睡好覺。其實，科學研究表明，有一點背景噪聲的話，反而會讓我們睡得更好。
Noise helps us sleep better
by Jenn Savedge
Want to get a better night's sleep? You may just need more noise. While that may sound counterintuitive（與直覺相反的）, it's scientifically proven that certain types of noise can help you catch some zzz's.
scientifically /ˌsaɪənˈtɪfɪk(ə)li/ adv. 科學上（由scientific加後綴-ally變成副詞）
zzz 指睡覺時的鼾聲
Think of it this way: When you're lying in bed, every single noise – from the creak（嘎吱聲） of the bed to a whistle in your partner's nose – may keep your brain on high alert. But some types of noise, specifically white, pink and Brown noises, can muffle and mask these sounds, creating a more consistent ambient（周圍環境的） background.
single /ˈsɪŋɡ(ə)l/ adj. 單個的（這裏表示強調）
whistle /ˈwɪs(ə)l/ n. 口哨聲（這裏指鼾聲）
alert /əˈlɜːt/ n. 警惕
specifically /spəˈsɪfɪk(ə)li/ adv. 具體來說
muffle /ˈmʌf(ə)l/ v. 使（聲音）變低、使聽不清
mask /mɑːsk/ v. 遮蓋
consistent /kənˈsɪst(ə)nt/ adj. 一致的
background /ˈbækɡraʊnd/ n. 背景聲音
Just as white light includes all of the colors of light in the spectrum, white noise contains sounds from all of the frequencies that humans can hear. The sounds come together to sound like a fuzzy（模糊的） hiss（嘶嘶聲） of static – like the snow on the TV back when televisions did that sort of thing.
spectrum /ˈspektrəm/ n. 光譜
frequency /ˈfriːkwənsi/ n. 頻率
static /ˈstætɪk/ n. （電視、廣播等）無信號時的噪音
It's an amalgamation（混合體） of sounds from all frequencies, but white noise comes across as a high-pitched buzz. That's because of the way your ears hear it. Basically, your brain amplifies（放大） sounds in the higher pitch frequencies, making them sound louder than they actually are. So while you may be hearing sounds from a variety of frequencies, the highest ones tend to drown out the lower pitched notes.
come across 表現、呈現
high-pitched 音調高的
buzz /bʌz/ n. 嗡嗡聲
basically /ˈbeɪsɪk(ə)li/ adv. 基本上、大體上（由basic加後綴-ally變成副詞）
pitch /pɪtʃ/ n. 音調
tend /tend/ v. 傾向於
drown /draʊn/ out 蓋過（某個聲音）
note /nəʊt/ n. 基本聲音、聲音元素
Pink noise takes the human tendency to hear only some frequencies into account and balances out the noise so that all frequencies are heard equally. The higher the frequency, the more its volume is dampened（減弱）. To your ears, the sound is deeper and softer than white noise. Think of rain falling on the pavement or a gentle breeze in the trees.
take something into account 考慮到某事物
tendency /ˈtendənsi/ n. 傾向（由tend加後綴-ency變成名詞）
balance /ˈbæl(ə)ns/ v. 使平衡
equally /ˈiːkwəli/ adv. 相等地、同等地（由equal加後綴-ly變成副詞）
volume /ˈvɒljuːm/ n. 音量
pavement /ˈpeɪvmənt/ n. （鋪好的）路面
breeze /briːz/ n. 微風、輕風
In a study at China's Peking University, researchers found that when participants were exposed to either pink noise or no noise during nighttime sleep and naps, 75% reported more restful sleep with the pink noise. Brain activity monitors confirmed this, showing that participants had 23% more restful brain activity at night with pink noise and 45% more restful sleep during naps.
researcher /rɪˈsɜːtʃə(r)/ n. 研究者（由research加上表示人的後綴-er）
participant /pɑːˈtɪsɪp(ə)nt/ n. 參與者
expose /ɪkˈspəʊz/ v. 暴露、直接接觸
nighttime /ˈnaɪttaɪm/ n. 夜間（由night和time組成）
nap /næp/ n. 打盹
restful /ˈrestf(ə)l/ adj. 令人放鬆的
activity /ækˈtɪvəti/ n. 活動
monitor /ˈmɒnɪtə(r)/ n. 監測儀
confirm /kənˈfɜːm/ v. 證實
Brown noise takes this concept to the next level, further dampening noise at higher frequencies to produce an even deeper, richer sound. Think of a roaring waterfall or evenly（均勻地） crashing ocean waves. It's not named after the color brown but rather after the botanist（植物學家） Robert Brown, who in the 1800s discovered random particle motion, also called Brownian motion. Brown, or Brownian, noise is similar to random particle motion in that the changes in sound signals from one moment to the next occur randomly.
concept /ˈkɒnsept/ n. 概念
level /ˈlev(ə)l/ n. 水平、高度
rich /rɪtʃ/ adj. 豐富的
roar /rɔː(r)/ v. 大吼、轟鳴
waterfall /ˈwɔːtəfɔːl/ n. 瀑布
crash /kræʃ/ v. 撞擊、拍打
random /ˈrændəm/ adj. 隨機的
particle /ˈpɑːtɪk(ə)l/ n. 微粒
motion /ˈməʊʃ(ə)n/ n. 運動
signal /ˈsɪɡn(ə)l/ n. 信號
occur /əˈkɜː(r)/ v. 發生
randomly /ˈrændəmli/ adv. 隨機地（由random加後綴-ly變成副詞）
When it comes right down to it, the color of noise that will help you sleep most soundly is the one you like the best. While pink and Brown noises are deeper and more balanced than white noise, your personal sleep preferences will dictate which one gives you the best night's sleep.
when it comes right down to it 歸根結底
soundly /ˈsaʊndli/ adv. 睡得沉地
preference /ˈpref(ə)r(ə)ns/ n. 偏好（由prefer加後綴-ence變成名詞）
dictate /dɪkˈteɪt/ v. 決定、支配
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