Sweet Dreams. Some people believe that teenagers need nine and a half hours of sleep a night, but very (13) ___ teenagers get that; they usually get only seven and a half hours. What does that mean? People who study how much sleep teenagers (14) ___ believe that when children don't get (15) ___ sleep, they get tired quickly and can get a cold more (16) ___. This means that if a teenager doesn't get as much sleep as they should for a long time, they will become (17) ___ even more often. Many teenagers get a 'sleep delay phase' around the (18) ___ of sixteen, and that can be the reason (19) ___ their sleep problems. This means that they go to bed quite late and don't wake up before midday; this is more usual at weekends. So parents should try to make sure that their children get a good sleep and they should not (20) ___ their teenage kids go to bed very late. 13. A. few B. little C. much 14. A. have to B. should C. need 15. A. too much B. enough C. a lot 16. A. easy B. easier C. easily 17. A. pain B. temperature C. ill 18. A. year B. age C. time 19. A. of B. to C. for 20. A. let B. leave C. get

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