Multiple-choice cloze

Most teenagers need between eight and ten hours of sleep a night, but many of them 1. (1) much less than that. One reason is that teenagers' bodies want to go to bed later than adults' bodies do. Another reason is phones. The light from a screen can make it 2. (2) to fall asleep, so doctors 3. (3) turning off your phone an hour before bed. Without enough sleep, it is hard to 4. (4) attention in class, and you may feel hungry more 5. (5). So if you want to do well at school, try to go to bed at the same time every night, even at the 6. (6)!

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