A lot of noise comes from his flat in the evening. He’s happy to stay up watching TV till after midnight, while I go to bed early and try to sleep.

　　Well, it might not be his fault after all. I’m called “a lark (百灵鸟)” and my neighbour “an owl (猫头鹰)”．

　　We all have inside “clocks” in the brain to control all kinds of bodily functions and it is reset every day by light. These inside clocks run to a different schedule in “larks” and “owls”. If you have a fast clock, you like to do things early, and if you have a slow clock, you like to do things late.

　　Because we live in a 24/7 world, scientists believe it’s important to understand a person’s “chronotype” — the time of the day when they function the best. It could help us lead a healthier life.

　　A US professor has studied sleeping patterns and thinkswork times should be changed and made more individual to fit in with our chronotypes.

　　And he has advice for those who can’t choose their working hours: “If that’s not possible, we should be more careful about light exposure，” says the professor. “You should try to go to work not in a covered vehicle but on a bike. The minute the sun sets we should use things that have no blue light, like computer screens and other electronic devices.”

　　语篇解读：本文是一篇说明文。作者通过分析自己和邻居不同的作息情况，说明了每个人都有自己的睡眠类型：有的人晚上的工作效率高，有的人白天的工作效率高。但是，如果无法选择工作时间，那么就应在晚上尽量避免蓝色的光，因为蓝色的光可能会导致睡眠问题。13．How is the passage mainly developed?

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