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

4. What is “social jetlag”? “Social jetlag” is a phenomenon where your sleep pattern and work schedule don't match, meaning you feel constantly tired - as if you are in the wrong time zone.

5. What do office workers in Korea do to help them concentrate better at work? They have short power naps to restore energy and alertness.

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 early bird - I’m at my best in the mornings.

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

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

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

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

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