You look tired. You are in need of sleep.
你看起来很累，你需要睡眠。
Each kind of mammals, birds and most reptiles, amphibians animals and fish are in need of sleep to maintain normal life activities.
每一种哺乳动物、鸟类和大多数爬行动物、两栖类动物和鱼类都需要睡眠来维持正常的生命活动。
Of those, about 25 percent who said they felt fine were actually so in need of sleep that they posed a danger to themselves or others.
这些人中，说自己感觉良好的人约有25%其实非常需要睡眠，以致他们对自己或他人构成了威胁。
In places like Bali and New Guinea, people tend to slip in and out of sleep as they need it, napping more during the day, and getting up more at night.
在有些地方，例如巴厘岛和新几内亚，人们喜欢随时根据需要进入睡眠和醒来，白天时不时的打个盹儿，晚上却经常的爬起来不睡觉。
In general, babies need fifteen to sixteen hours of sleep a day.
一般来说，婴儿每天需要15到16个小时的睡眠。
Humans Need eight Hours sleep a Night: There are many ways of sleeping and few cultures sleep in eight-hour consolidated blocks like we do.
人每天晚上需要八小时的睡眠：我们有很多种睡眠方式和少数几种睡眠文化传统，就像大多数人每天要连续的睡八小时。
But behind the scenes, a vast team of doctors and scientists have been working nonstop, ignoring trivial matters like the need for sleep and, in some cases, personal catastrophe.
然而在这一幕幕的背后，有一支庞大的医生和科学家队伍一直在无休止地工作，顾不上象睡眠需要那样看似平凡琐碎的小事，有时甚至抛开了个人的不幸。
Therefore, high levels of social stimulation may be associated with an increase in the need for sleep.
因此，越强的社会活动刺激可能导致越严重的睡眠不足。
But if the lack of sleep becomes a chronic problem in your work, this might be an issue you would need to consider to find out if the job is suitable for you in the long run.
但要是你的工作使你长期缺少睡眠，你就有必要考虑自己是否适宜长期从事这个工作了。
When people fall in love they can think of nothing else. They might even lose their appetite and need less sleep, preferring to spend hours at a time daydreaming about their new lover.
人们陷入爱河时，会把所有其他事情抛在脑后，甚至茶饭不思得一直想着他的新爱人。
We'll return to the topic of how much sleep you need and how to measure it in a moment; for right now let's focus on what you can do tonight.
待会我们会再回到这个话题，现在让我们先谈谈你今晚该做些什么。
He said patients suspected of being in a non-reversible coma should be "tested 10 times" and that comas, like sleep, have different stages and need to be monitored.
他说，被疑为处于不可逆昏迷状态的患者应该“被检查十次”，昏迷，就像睡觉，有不同的阶段，需要得到监测。
Blinded by sleep and in need of a bed.
闭着眼睛睡觉她大概需要一张床。
The findings highlight the need for improved diagnosis and treatment of circadian rhythm sleep disorders in patients who've had a mild brain injury and complain of insomnia.
这项发现强调了在那些受到过轻微脑损伤后抱怨失眠的病人中，我们需要提高对昼夜生物节律睡眠障碍的诊断和治疗。
Of course, we are unable to sleep in wherever we are and whenever we want to, rather, we need to find time, that is, when work allows us to do so.
当然，睡大觉并非是随时随地都可以做到的，而是要找时间，在工作允许的情况下。
"Our data underscore the need to monitor the quantity and quality of sleep as part of health supervision in children," they write.
她们写到：“我们的资料强调了在对儿童进行健康监测中睡眠时间和质量监测的必要性。”
Sheldon, what are you doing out of bed? Sheldon Now! Do it! You know you need your sleep in order for your cognitive processing to perform at optimum levels.
你不睡觉在干啥呢?，快！，消灭她！你需要足够的睡眠以保证，认知表现处于适宜的水平。
The need to sleep near fire and in larger groups for warmth and safety could have allowed these early humans to get the most out of their sleep in the shortest possible time.
由于睡觉时需要靠近火和更大的人群保持温暖和安全，这可能使得早期人类尽可能在最短时间内睡得最好。
To say nothing of the boost in energy and reduced need for sleep?
说没有任何提高精力、减少睡眠需要的事情？
If older people believe that they need more sleep than they can achieve even when they spend extra time in bed, then they may complain of insomnia: being awake when wanting to be asleep.
她还说：“如果老年人相信比起他们用更多的时间用于睡觉可以达到睡眠时间，他们需要更多的睡眠，那么他们可能会抱怨自己失眠：想睡觉却睡不着。”
If older people believe that they need more sleep than they can achieve even when they spend extra time in bed, then they may complain of insomnia: being awake when wanting to be asleep.
她还说：“如果老年人相信比起他们用更多的时间用于睡觉可以达到睡眠时间，他们需要更多的睡眠，那么他们可能会抱怨自己失眠：想睡觉却睡不着。”
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