Without sleep you will become a zombie at work.

如果不睡觉，工作时会变得无精打采的。

《柯林斯英汉双解大词典》

With the right amount of sleep you should wake up fresh and alert five minutes before the alarm rings.

有了适量的睡眠，你就应该在闹钟响前的五分钟精神抖擞地醒来。

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The older you get, the less sleep you will need.

年龄越大，所需睡眠就越少。

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And,if you wish someone good night, you might say, "sleep tight -- don't let the bed bugs bite."

VOA: special.2009.06.28

That depends on how much sleep you get but dreams leave fragile memories. They fade quickly.

这要取决于你一晚睡多长时间,梦境会留下一些若有若无的记忆，而且很快会淡忘。

耶鲁公开课 - 心理学导论课程节选

But my only criterion is if you talk in your sleep, now that's not allowed because talking is not allowed.

我唯一的要求就是别说梦话,因为我的课上不准说话的

耶鲁公开课 - 基础物理课程节选

You can affect your mood by how much sleep you get, how much sunlight you get, or what kind of gut bacteria you have.

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When it was very, very hot in the middle of the day there was not point in being out, and you could actually use that period to get some sleep so you needed less sleep at night.

BBC: How we go to sleep

It's an enzyme called tryptophan which helps you manufacture enough serotonin so that you can sleep when you need to and it helps keep you alert and able to concentrate.

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