New shows children should not watch TV, tablet or phone screens before . Researchers found that "screen time" before sleeping is for children's health. The researchers looked at over 60 studies on how bad screen time is for children from 5 to 17. They said that 90 per cent of the studies found that screen time delays bedtime. It also leads to hours of sleep, and poorer sleep . Screens are becoming , so children can look at them in bed. Most children in the study had some of screen in their bedroom.
Children need more than adults. Pre-school children need up to 13 hours, pre- up to 12 hours, and teenagers should get around nine hours a . The researchers found three why screens affected children's sleep. First, the light from screens upsets a child's body . It gets into children's before they sleep, and makes children think it is . Second, children watch videos of things that excite . This keeps their brain active, so they take to sleep. Finally, when children are watching screens, they are not exercising, so they are not .