该文本主要围绕“睡眠”这一主题展开，通过解释睡眠的重要性、成年人及青少年所需的睡眠时间、睡眠不足的危害以及当前社会普遍存在的睡眠不足问题，来向读者传达关于睡眠的知识和观念。
根据下面短文内容及部分首字母提示，在短文的空格处填上一个最恰当的词，使文章完整、通顺。
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短文：
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“Do you get enough sleep?” The answer is probably no if you ask a tired student who is always taking a nap (小睡) on a classroom desk. “I couldn’t get to sleep and experienced a restless night again.” You may often hear such words from an adult. Not having enough ____1____ is a common problem around the world.
“你睡够了吗？”如果你问一个在教室课桌上总是打盹的疲惫学生，答案很可能是没有。“我睡不着，又度过了一个不眠之夜。”你经常可以从一个成年人那里听到这样的话。睡眠不足是全世界普遍存在的一个问题。
However, sleep is just like food and water to us. ____2____ of us can live if we don’t sleep at all. Sleep experts say that an adult requires 7 to 9 hours of sleep a night and a teenager needs 8.5 to 9.5 hours. Anything less could be h___3____ to our health.
然而，睡眠对我们来说就像食物和水一样重要。如果我们完全不睡觉，我们中的任何人都无法生存。睡眠专家说，一个成年人每晚需要7到9小时的睡眠，而青少年则需要8.5到9.5小时。少于这个时间都可能对我们的健康有害。
According to a study, sleeping only five hours a night for a week is like having a blood-alcohol (酒精) level of 0.1 percent. That is above the safe driving limit (限制) in most countries. Most people probably wouldn’t take an exam or go to work if they get drunk. But ____4____ enough sleep, they still do these things. As a result, they ____5____ in the exams or perform badly at work. What’s worse, doctors and nurses often work long hours. When they are sleepy, they might hurt a patient or even ____6____ a patient’s death by accident.
根据一项研究，每晚只睡五个小时持续一周，其效果就像血液酒精浓度达到0.1%一样。这在大多数国家都超过了安全驾驶的限制。大多数人如果喝醉了可能不会参加考试或去上班。但如果没有得到足够的睡眠，他们仍然会去做这些事情。结果，他们在考试中不及格或在工作上表现不佳。更糟糕的是，医生和护士经常长时间工作。当他们感到困倦时，他们可能会伤害病人，甚至意外地导致病人死亡。
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