There are two reasons for this. First, online games are so addictive that they take up valuable time that could be spent on more productive activities, such as studying or exercising. In particular, children tend to cut down on their sleeping time to play games, leading to a serious decline in academic performance. Second, online gaming can be detrimental to players' health by increasing sedentary behavior and exposure to computer screens. It can cause eye strain, poor posture, sleep deprivation, and sometimes metabolic syndrome.