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It's important to get enough sleep. We are often told that it's important to get enough sleep, but do we know why?
睡眠充足很重要。我们经常听到睡眠充足很重要，但是我们知道为什么吗？
The truth is, even scientists can't agree on why we need to sleep. However, it's clear that the less we sleep, the worse we perform in everyday life.
真相是，甚至科学家都无法对我们为什么需要睡眠达成共同意见。但是很明显睡得少，在日常生活中我们表现就越糟糕。
Have you ever felt tired in the middle of the day, especially after lunch? Actually, this is quite normal.
中午尤其是午餐之后，你有没有感到疲惫？事实上，这是相当正常的。
Researchers have found that it may be healthier to sleep twice a day - a long sleep at night, and a nap in the afternoon.
研究人员发现一天睡两次更加健康—晚上一次长时间睡眠以及中午一次小憩。
Even a ten-minute nap at lunchtime can allow us to work better in the afternoon.
中午睡十分钟也能让我们下午工作更好。
And if we really can't find a chance to nap, we should get a longer sleep at night so we don't feel tired after lunch.
如果我们没时间小憩，我们应该在晚上睡得更久一点，这样午餐后就不会觉得累了。
Not getting enough sleep has serious effects on our brain's ability to work.
得不到充足睡眠对我们大脑的工作能力有着严重影响。
If you go without sleep, you might have problems with your memory or with your concentration.
不睡觉，你或许会出现记忆问题或是注意力问题。
In order to concentrate at school or perform well in tests, we really need to get a good night's sleep.
为了上课专心或是在测试中取得高分，我们真的需要晚上睡个好觉。
Some people have trouble sleeping, especially if they are nervous or stressed about something.
一些人有睡眠问题，特别是如果他们紧张或压力大。
Sleep experts say that it's better not to try too hard to get to sleep, and certainly not to keep looking at the time.
睡眠专家表示最好不要太过努力的尝试入睡，也不要一直看时间。
To have good sleeping habits, it's better to sleep at regular times, and to sleep in a dark and quiet environment.
为了养成好的睡眠习惯，最好按时睡觉，并且在黑暗安静的环境中入睡。
It's also good not to sleep too soon after eating, or after drinking too much water.
也不要在饭后或喝太多水后入睡。
The amount of sleep we need is different from person to person, though the average seems to be just under eight hours.
我们所需的睡眠量因人而异，但平均时间是8小时。
Jim Steed, a sleep researcher, has a simpler way of looking at it. "Forget about facts and figures. If we feel tired in the daytime, it means we need to get more sleep."
睡眠研究员，吉姆.斯蒂德有一种更简单的方法。”忘掉事实和数据。如果我们白天感到疲劳，这就意味着我们需要更多的睡眠。”
