They sleep by day and hunt by night.
他们白天睡觉，夜晚捕猎。
Nocturnal animals sleep by day and hunt by night.
夜间活动的动物白天睡觉晚上猎食。
In general, each of us needs about 8 hours of sleep each day to keep us healthy and happy.
一般来说，我们每个人每天需要大约8个小时的睡眠，以维持健康和保持愉悦。
I'll sleep all day and I'll stand watch all night.
我白天睡觉，晚上站岗放哨。
We text our friends with them during the day, sleep with them by our beds and check our messages as soon as we wake up.
我们白天和他们一起给朋友发短信，和他们一起睡在床上，一醒来就查看短信。
The most common topics they discussed included kids' sleep, nutrition, discipline, behavior problems and day care and preschool.
他们最常讨论的话题包括孩子的睡眠、营养、纪律、行为问题，以及日托班和幼儿园。
Every year, there is a special day for people around the world to celebrate the importance of good and healthy sleep—World Sleep Day.
每年，世界各地都有一个特殊的日子来纪念良好和健康睡眠的重要性——世界睡眠日。
Ground squirrels are normally active by day and sleep at night.
地松鼠一般白天活跃晚上睡觉。
An elderly person may nap during the day and then sleep only five hours a night.
上了年纪的人白天会小睡一会儿，然后晚上只睡5个小时。
Go to sleep. I've got a long day tomorrow.
去睡吧。我明天要工作很长时间。
How long do giraffes living in the wild sleep every day?
在野外生活的长颈鹿每天要睡多久？
我每天睡眠7小时。
We sleep 7 hours a day, which is obviously not adequate for young students.
我们每天睡7小时，这对于青年学生来说明显是不够的。
Once you determine your sleep needs, you should meet those needs every day.
一旦你决定你的睡眠需求，你应该每天满足那些需求。
蝙蝠在白天睡觉。
"We wake up from dreams happy or depressed, and those feelings can stay with us all day," says Stanford sleep researcher Dr. William Dement.
“我们从梦中醒来时的高兴或沮丧情绪会伴随我们一整天。”斯坦福睡眠研究博士威廉·德门特博士说。
Hello my one and only love, I miss you every day and can not even sleep.
您好，我唯一的爱，我每天都想念您，甚至不能睡觉。
Right now, a billion people are chronically hungry. That means they wake up hungry, they are hungry all day, and they go to sleep hungry.
现在，10亿人长期处于饥饿状态，这意味着他们醒来时会感到饥饿，整天饿着肚子，睡觉时也是如此。
Right now, a billion people are chronically hungry which means they wake up hungry; they are hungry all day and they go to sleep hungry.
现在，10亿人长期处于饥饿状态，这意味着他们醒来时会感到饥饿；他们整天饿着肚子，睡觉时也饿着肚子。
It was easy for us to go to sleep at the end of the day feeling a little misunderstood.
在一天结束的时候，我们很容易在被误解的感觉下入睡。
During the day, your brain is a beehive of activity—during NREM sleep, it is barely humming.
在白天，你的大脑就像一个活跃的蜂窝——在非快速眼动睡眠期间，它就几乎没有嗡嗡声了。
我睡了一整天。
The most common topics they discussed included kids' sleep, nutrition, discipline, behavior problems, day care and preschool.
他们最常讨论的话题包括孩子的睡眠、营养、纪律、行为问题、日托和学前教育。
A 2008 British study found that compared to getting more nighttime sleep, a mid-day nap was the best way to cope with mid-afternoon sleepiness.
2008年英国的一项研究发现，与获得更多的夜间睡眠相比，午间小睡是应对午后困倦的最佳方式。
A 2008 British study found that compared to getting more nighttime sleep, a mid-day nap was the best way to cope with the mid-afternoon sleepiness.
2008年英国的一项研究发现，与获得更多的夜间睡眠相比，午间小睡是应对午后困倦的最佳方式。
Some students can't sleep well the day before a math exam.
一些学生在数学考试前一天睡不好觉。
An adult koala normally eats between 0.5 and 0.8 kg of leaves a day, Koalas sleep about 20 hours a day.
一只成年考拉通常一天吃0.5到0.8公斤的树叶，一天大约睡20个小时。
Children need 10-12 hours of sleep a day.
儿童每天需要10-12个小时的睡眠。
Middle school students should have at least 8 hours' sleep every day.
中学生每天至少应该保证8小时的睡眠时间。
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。
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