New research shows that it is bad for children to watch TV, tablet or mobile phone screens before [bedding / bedtime] . Researchers from the University of Colorado found that "screen time" before sleeping [damaging / damages] children's health. The researchers looked at over 60 different [studies / studious] on how screen time [effects / affects] children. They said: "Of more than five dozen studies looking [at / to] children aged from 5 to 17 around the world, 90 per cent have found that [many / more] screen time is associated with [delayed / delays] bedtime, fewer hours of sleep, and poorer sleep [quality / qualify] ." Screens are becoming smaller and smaller, so children can look at [them / it] in bed. More than 75 per cent of children in the study had some kind of screen [in / at] their bedroom.
Children need a [lot / loads] more sleep than adults. Pre-school children need 10 to 13 hours, pre-teens should get [among / between] nine and 12 hours, and teenagers should be [gotten / getting] between eight and 10 hours a night. The researchers highlighted three [main / mainly] reasons how screens affect children's sleep. First, the light from screens upsets a child's body [watch / clock] . The light from screens getting into children's eyes before they sleep [tricks / ticks] their body into thinking it is [still / yet] daytime. Second, children often watch videos of things that excite them or [interest / interests] them. This keeps their brain [actively / active] , so they take longer to sleep. Finally, when children are watching screens, they are not exercising. Children need physical activity to make them [tired / tried] .