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Read the text below. Fill in each gap with one word which best fits each space (1-4). More than a quarter of American teenagers nod off in class 1) least once a week, according to the National Sleep Foundation. As experts say, the average teen needs about nine and a half hours of sleep but gets only about six or seven. Blame an early bell, which at most high schools rings before 8 a. m. That's too early for teen brains, which produce sleep-inducing melatonin later at night, making it hard for them to 2) asleep before 11 p. m. The solution: start school later. High schools in 19 states now start at least an hour later 3) before, opening around 8:30 a. m. Others are discussing it. Minneapolis and suburban Edina public schools were first in the country to move to later start times; educators say attendance is up and discipline problems — down. «The later students slept on school days, the 4) their results ...were», says the University of California, San Diego.