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.

Mike: __________

John: Morning, Mike.

伍子胥是我国春秋时代吴国的大夫，他被任命为吴国的大夫之前曾受到楚平王的追捕。伍子胥只好白天躲藏，晚上逃跑。一天，他终于来到了吴楚两国交界的昭关，关上的官吏盘查的很紧，城门上还挂着楚平王悬赏捉拿伍子胥的告示和画像，如果逃出关，伍子胥就会摆脱追捕，否则就会危在旦夕。为此，伍子胥十分焦急、忧愁，一连几夜睡不着觉，愁得连头发都白了。据此回答问题：