Question

帮忙翻译下

No one knows why we sleep, but it’s certain that we need to. People who are prevented from sleeping begin to suffer obvious effects after a few days—they think less clearly, and they fall asleep during the working hours.
There are no rules about sleep. Generally speaking, grown-ups sleep about 7 and a half hours each night and probably more than 60 percent get between seven and eight hours. But perhaps eight percent are quite happy with 5 hours or less, and four percent or so find that they want ten hours or more. If you feel all right, you’re probably getting enough sleep. The important thing is not to worry how much other people get—their needs may be different. Exercise doesn’t seem to increase the need for sleep—office workers, for example, sleep for about as long as people doing physically active work.
Children sleep more than grown-ups—perhaps 14 to 18 hours soon after birth, going down to grown-up levels by early teenage (青少年). Sleep patterns also tend (倾向) to be different in the old people, who may sleep less at night than they did when younger, find sleep getting more broken, and often make it a rule to sleep during the daytime。

Answer 1

没有人知道我们为什么要睡觉，但是我们都必须要睡觉。那些不睡觉的人几天后明显感觉不舒服，当他们在工作时候，思维会变慢。
没什么关于睡觉多少的规定，通常说来，每天晚上成年人睡七个半小时，大约60%的人在七到八小时之间。但是大约8%的人睡少于五个小时就可以了，只有大约4%的人发现他们需要是十个小时的睡眠。如果感觉良好，那么你的睡眠就是足够的。关键不是担心别人睡觉的多少，因为每个人的睡眠多少是不一样的。锻炼似乎不能增加对睡眠的要求，就像，办公室人员与那些做工的睡眠是一样的。
儿童睡觉要明显多于成年人，自从出生以后大约十四到十八小时，然后逐渐较少到成年人的水平到青少年时。睡眠的 形式似乎也与老年人不同，当他们年轻的时候，他们或许在晚上睡得比白天少。还还会发现，睡眠质量变得越来越差，白天睡得多，成了一个习惯。

补充：上面的回答是用软件翻译的，很多错误

Answer 2

没有人知道为什么我们睡觉的时候,但我们一定需要。那些无法睡觉会发病,效果明显days-they经过几次的看法清楚地,并且他们在工作时间入睡。
关于睡眠并没有什么特定的规则。一般来说,成年人每晚睡眠达7个半小时,每天晚上,可能超过60%的人得到7到8小时。但或许8%是非常满意,少于5个小时的4%左右发现他们想要1小时或更多。如果你感觉还好,你可能有充足的睡眠。重要的是不要担心别人如何get-their的需求可能不同。锻炼不需要增加看来sleep-office工人,例如,睡眠大约只要人们做身体活动的工作。
孩子睡超过grown-ups-perhaps 14 - 18小时...