14-year-old Brooke Erickson likes to sleep．1On weekends，she wants to sleep late(睡懒觉)．But Brooke' s mum thinks that Brooke should get up at the same time every day,so she'll get used to(习惯于)getting up early．

    Both(两个)Brooke and her mum are right．Sleeping late in the morning makes it more difficult to sleep at night．2Then it gets more difficult to get up the next morning．Getting up and going to bed at the same times every day helps the body to get enough rest(足够的休息)．

     3They need 8 to 9 hours of sleep each night，but many of them can only get 6 to 7 hours of sleep on school nights．If someone doesn't have enough sleep for a long time，he may feel tired and not happy,and be easier to get ill．Being tired makes it more difficult to remember things，to do well in school and to do well in sports and other activities．

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