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A recent study warns that too much time spent playing computer games could hurt performance in school. The National Children’s Bureau reported the results of the study. It says that too many hours of computer use can decrease student success in school. The National Children’s Bureau is a private organization that explores issues affecting children and young people in Britain. Recently, the Northern Ireland office reported the results of a study called ICT and Me. The study involved more than 600 teenagers between the ages of 14 and 16. It took place over a period of two years, from 2012 to 2014. It found that teenagers who played computer games less than once a week were more successful in school than those who played them twice a day or more. 41 percent of the students who used gaming devices two or more times a day received passing grades in school exams. That compared with 77 percent of those who rarely played the games. The study found that social media use did not affect school performance. Many parents say their children are becoming increasingly dependent on computer games. Some have compared excessive gaming to drug addiction. The study did not explore addiction. But it did suggest that computer games can cause children to stay awake late at night. A lack of sleep makes children tired. Tired children are more likely to have trouble paying attention in school.