All over the world, temperatures are going up at night due to global warming. A study found that when the temperature at night is over 30°C, the length of nightly sleep decreases by over 14 minutes. This may not seem like a lot at first, but a study reveals that a global average of 44 hours of sleep are lost for each person per year. When people lack sleep, their immune systems become weak. They get sick and forgetful, and there is even a higher risk of major diseases like cancer.
由於全球暖化，世界各地的夜間氣溫都在上升。一項研究發現，當夜間溫度超過攝氏三十度時，夜間睡眠時間會減少超過十四分鐘。起初這可能感覺不多，但一項研究指出全球平均每年每人失去四十四小時的睡眠時間。當人們缺乏睡眠時，他們的免疫系統就會變弱。他們會生病、變得健忘，甚至有更高的風險罹患癌症等重大疾病。
生活必備字詞：
global warming 全球暖化
decrease vi. 減少
risk n. 風險
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本文節錄自《常春藤生活英語》雜誌，完整內容請見一月號。
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