Watching TV or phone screens(屏幕) before sleeping is bad for children’s health. Screen time means children go to bed later. They have less sleep, and they can not sleep well. Screens are small, so children can look at them in bed.
Children need more sleep than people of other age groups. For pre-school children, they need 13 hours of sleep a night. There are some reasons(原因) why watching screens are bad. First, the light from screens makes children think it is not in the evening. Then, videos keep children’s brains active, so they cannot sleep. At last, when children are watching screens, they are not exercising. But children need physical activities to make them tired.
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