题目内容
[1] One of the tough things about being a high school student is that you never Seem to get enough sleep at night, which often leaves you nodding off during classes．The best amount of sleep is about seven and a half to eight hours．Spending either less than six or more than nine hours in sleeping puts your health at risk．
[2] A popular solution to a lack of sleep at night is to take a “power nap” during the day, but does this work?
[3] Generally speaking, it can be beneficial．Research shows that a nap in the middle of the day—even a brief one as Short as five or 10minutes—can clear your mind and leave you with increased energy and improved productivity．
[4] But here are some things you need to know to do it correctly．To start with, every time you doze off （打瞌睡） during the day does not count as a “power nap”．The best time to take a power nap is in the mid-afternoon, when your energy level tends to decrease．
[5] But how long should a power nap be? Ideally, it should be kept to between 10 and 30 minutes．Nodding off for five minutes does not really provide established sleep．If you, however, go into the deeper stage you will wake up feeling weak．
[6] However, refreshing as it might be, if you get adequate sleep at night, taking a power nap isn’t such a wise choice．The reason is that sleeping during the day can interfere with your body’s biorhythms．The brain gets used to going to bed and getting up at roughly the same time each day, and you don’t want to disturb this routine．
[7] One more thing to keep in mind is that a power nap should never be used as a replacement for a good night’s sleep．A power nap during the day is not like a tablet which will definitely work．An hour’s sleep before midnight is worth a couple of hours’ sleep after midnight．
1.What is the main idea of the passage? （no more than 5 words）
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2.What if a person spends less than six or more than nine hours in sleeping?
（no more than 9 words）
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3.According to Paragraph 3, what benefits can we get from a nap in the middle of the day?
（no more than 4 words）
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4.When is the best time to take a power nap? （no more than 5 words）
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5.Why is it sometimes unwise to take a nap? （no more than 8 words）
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