During the day, you spend a lot of time running, jumping, laughing, eating, and talking. You use up a lot of energy(能量), and by the end of the day you're tired. Sleep gives your body a chance to rest.

    But your brain (大脑) and body are not completely at rest during sleep. While you sleep, your mind may think of the things that happened during the day. It keeps the important things in mind as memories(记忆). It also thinks about things you were worrying about, and you may wake up with answers to some of your problems.

    You also grow while you sleep. The thing called "human growth hormone (荷尔蒙)" in the body helps you grow during sleep. This growth hormone also helps the body to repair itself.

    Sleep helps your body to conserve energy too. You use up a lot of energy during your daily activities. But when you sleep, your body temperature falls, and your "metabolism" (新陈代谢) slows down. You are still using some energy, but much less than when you are awake and active.

    Have you ever stayed up past your bedtime? Did you have difficulty getting up the next morning? Maybe you had problems seeing clearly or you cannot think clearly. That was your body's way of saying, "I need sleep!" A lack ( 缺乏) of sleep can stop your body and mind from working correctly.

材料一  对于国家的研究，亚里士多德舍弃了他的老师柏拉图的方法，开辟了一条通过广泛调查，以现实中的150多个城邦的实例作为研究对象，经过分析、比较和归纳的方法，提出了他的政治学说。柏拉图所运用的是抽象、演绎的方法，构筑了他的理想国，提供给人们的是想象中的理想国家。

——应克复《西方民主史》

材料二  共和政体不应凭借外力支持，而要依赖内在均势来求其稳定。至于就内在力量而言，有大多数人维护这种制度还是不够的，因为一个不良的政体也可能得到多数人拥护的。只有全邦没有任何一个部分存在着改变现制的意愿，这才算是稳定……不让任何人在政治方面获得脱离寻常比例的超越地位……人在达到完美境界时，是最优秀的动物，然而一旦离开了法律和正义，他就是最恶劣的动物……法律不应该看做奴役，法律毋宁是拯救。

——亚里士多德《政治学》

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