Questão 492 de Língua Inglesa

Teenagers are often described as lazy because they find it hard to get up early. Sleep researchers, however, explain that during adolescence the body's internal clock shifts, making it natural for teens to feel sleepy later at night. In a two-year study at several high schools, classes started one hour later than usual. Students slept more on school nights, were absent less often and reported feeling more alert in morning classes.