Usually, you must sleep for at least seven to eight hours every day, or you will get dark circles under the eyes.
通常，你必须每天至少睡7-8小时，否则你会有黑眼圈。
They mustn't worry; they must sleep; and rest stole into their jaded bones.
他们不用担心，他们必须睡觉，于是他们疲惫不堪的筋骨不知不觉地松弛了。
If we want to get up early we must sleep early and the time differs in each season.
如果大家要早起，那么就一定要早睡。春夏秋冬的入睡时间点可以不一样。
Since we must get up early, we must sleep early as well in order to ensure we have enough energy the next day.
因为我们的易效能时间管理提倡早起，所以反推，为了保证充足的睡眠时间，大家就必须得早睡。
The recommendation was to nap only 15 minutes, no more or less and you must sleep immediately after the coffee.
午睡时长推荐只一刻钟，并且必须是喝完咖啡后立马休息。
I'm clear enough in the head, he thought. Too clear. I am as clear as the stars that are my brothers. Still I must sleep.
我的头脑还足够能清醒，他想。我太清醒了，清晰到就像群星是我的兄弟。所以我仍然必须睡觉。
The researchers found women were more refreshed than men even when they slept the same number of hours and so concluded they must sleep more deeply.
研究人员们还发现，女性和男性睡眠时间相同的情况下，她们的精力会更充沛，由此推论，女性的睡眠要比男性深。
Alucard: Do not trouble yourself about it, Sonia. Now I must sleep. I fear I shall not meet you again. Farewell my beloved, my beautiful vampire slayer.
阿：别在这事上难为自己，索妮娅，现在我必须陷入沉睡。我想我们不会再见面了，别了我的爱人，我美丽的吸血鬼杀手。
I'm awfully sorry I must have turned the alarm off and gone back to sleep again.
非常抱歉，我一定是把闹钟关了，然后又睡着了。
They are alert at bedtime and sleepy when it is time to get up, and this may have nothing to do with how fatigued their bodies are, or how much sleep they must take to lose their fatigue.
他们在睡觉的时候很清醒，到了该起床的时候很困倦，这可能与他们的身体有多疲劳，或者需要多少睡眠才能消除疲劳无关。
When sleep is compared with wakefulness, and performance is better after sleep, then some benefit of sleep for memory must be acknowledged.
如果把睡觉和不睡觉进行比较，我们会发现睡觉后的表现更好，那么就必须承认睡眠对记忆的一些好处。
Sometimes, people went to sleep in them for a hundred years, which she had thought must be rather stupid.
有时候，人们会在里面昏睡百年，她觉得真是不可理喻。
There must be few questions on which responsible opinion is so utterly divided as on that of how much sleep we ought to have.
像我们应该睡多久这样的问题，几乎没有更多问题的可信赖意见的分歧如此之大。
You must have regular and sound sleep.
你必须要有规律良好的睡眠。
My happiness project has turned me into a sleep zealot. If I want to feel happy, calm, energetic, and mentally sharp, I must get enough sleep.
我的快乐方案让我变成一个睡眠狂热者，如果我想感觉快乐，平静，有活力，思维灵敏，我必须有充足的睡眠。
If I want to feel happy, calm, energetic, and mentally sharp, I must get enough sleep.
如果我想感受到快乐，平静，充满活力而且反应迅速，我必须获得充足的睡眠。
"So it's been thought that sleep must serve some as-yet unidentified physiological or neural function that can't be accomplished when animals are awake," he said.
“所以人们一直认为睡眠一定具有某种还未被辨知的生理或神经上的功用，而且在醒着的时候无法完成之，”他说。
The products must meet requirements in three different operating modes: standby, active and sleep modes.
这些产品在三种不同的运行模式下(待机、运行、睡眠)必须达到一定要求。
Ambient sound is the most common cause of sleep interruption, since even during sleep, the brain must actively receive sensory information.
周围环境中的噪音是造成睡眠中断的最常见原因，因为即便在睡眠期间，大脑也必须积极地接收感觉信息。
According to the Lucidity Institute, a group that promotes lucid dreaming research and theories, you must start with about five or six hours of sleep before attempting WILD.
据清醒协会(一个促进清醒梦相关理论建设和研究的组织)称，在五六个小时的睡眠之后你才能尝试这种清醒梦引发的方法。
Here the researchers must speculate a little. They suggest the answer may be the lack of association with other humans during the period of sleep.
这里研究者得做一些推测，他们认为答案可能是睡眠期间缺少与他人的交流。
Ten times must thou reconcile again with thyself; for overcoming is bitterness, and badly sleep the unreconciled.
每日必须自我和解十次，因为克制是件苦事，不能和解的人枕席难安。
“These conclusions explain why some animals can survive and reproduce optimally with only a few waking hours, whereas others need to eat all day and must have reduced sleep time, ” he told Nature.
最后他得出结论，有些动物每天只需要数小时就可以获得生存和繁衍所需的能量，而有些则需要一整天都在摄取食物。
He warns, however, that napping must not be done too late in the day or it will interfere with night-time sleep.
但是他也建议白天的小睡不应睡得太晚，否则会影响夜间的睡眠。
However, the new drug, Xyrem puts Claire into a deep sleep for three-and-a-half hours so she must take a second dose in the middle of the night to get a full seven hours sleep.
然而，新型药物“Xyrem”可以让克莱尔处于深度睡眠，连续睡上三个半小时，所以在半夜她要再吃上一次药，保证自己可以有7个小时的深度睡眠。
For example a bedroom must function well as a place to sleep and store clothing as well as looking nice.
例如一间卧室必须具备的功能是它是个睡觉的好地方而且可以储存衣物还要看起来很舒适。
Solution: Building healthy, lifelong habits is a must to getting a good night's sleep and enjoying life as a senior.
解决方案：养成健康的，终身的习惯，对于要获得良好的睡眠和享受老年生活是必要的。
Insomniacs often have trouble regulating their body temperatures, which must drop in order for sleep to occur.
身患失眠症的人通常无法调节自己的体温，而温度降不下来的话是没法入睡的。
Insomniacs often have trouble regulating their body temperatures, which must drop in order for sleep to occur.
身患失眠症的人通常无法调节自己的体温，而温度降不下来的话是没法入睡的。
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