2. How do smartphones disrupt our sleep?

3. True or false? Our short-term memory improves when we don’t get enough sleep?

4. What is “social jetlag”?

5. What do office workers in Korea do to help them concentrate better at work?

2. 请你在不参考课文的情况下完成下列练习。选择一个意思合适的单词填入句子的空格处。 

1. I am an ______ - I’m at my best in the mornings.

night owl       night bird       early bird       early owl

2. I had really bad ______ last night – I couldn’t get to sleep for hours. 

power nap       melatonin       insomnia       sleep

3. The film was so boring that I ______ while I was watching it.

drop off       dropped off       droped off       dropped of

4. I suffer from really bad ______ whenever I travel back from the USA.

jetlag       lagjet       jets lag       jetlags

5. I need a quick ______ before I go out tonight – if I don’t I’ll never stay awake.

slumber       power nap       hammock       second wind

答案 1. 阅读课文并回答问题。

1. Is the writer an early bird or a night owl? How do you know? He's a night owl, because he's often wide awake at night but finds it difficult to wake up in the morning.

2. How do smartphones disrupt our sleep? They affect the amount of melatonin we produce. This is a chemical which helps us sleep well.

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