奇速英语

睡眠不足影响学生学习能力

American high school students who slept less than seven hours each night during the pandemic(流行病) were more likely to have difficulty in school. That finding comes from a study from the U.S. Centers for Disease Control and Prevention, or CDC.

For the study, the CDC questioned 7,705 students about their sleep schedules and success in school. More than two-thirds of students said they experienced more difficulty in their schoolwork during the pandemic than before the pandemic. About 75 percent of students did not sleep enough during the pandemic, the study found.

Students who reported poor mental(心理上的) health during the pandemic were also more likely to get less sleep. 37 percent of students said they struggled with their mental health during the pandemic. But about 50 percent of students who slept five hours or less each night said they had poor mental health.

Teenagers experience many physical changes when they go through puberty(青春期). _________ As children get older, there is a change in their body’s natural clock. Before puberty, children may feel sleepy around 8 or 9 at night. But when they become teenagers, the body’s clock changes to make them tired much later—around 10 or 11 at night. Because of this, many teenagers may experience the difficulty in sleeping.

Some schools around the U.S. are pushing back start times for high schools so students can get more sleep. Usually, high schools start the earliest compared to middle and primary schools. The organization Start School Later supports the idea. It says at least 13,000 schools in the United States have changed start times.