①It might be fin to use your smartphone, but be careful. Too much screen time may be harmful to your health。
②First, it is bad for your eyes. A researcher called Sarah Hinkley says the problem comes from the blue light that the screen gives out. It does great harm to your brain and skin, especially to your eyes. So it is a good idea to take a break every 15 minutes when you are working at a computer or using a smartphone.
③Second, screen use can do harm to children's brains. A new study shows that using screens too much can affect (影响) children's brain growth. If children use screens for more than one hour a day, they might have lower levels of white matter in their brains. White matter is a key to the development of language and reading skills. So it is wise to cut down the time of children using all kinds of screens.
④Third, using screens too much will affect your sleep. According to a study, about 95% of the people between the ages of 13 and 64 use electronics before sleeping. And many people keep the screens on while sleeping, especially the young people. Doctors say that the light from those electronics at night may make you excited before you go to bed. Then it's hard for you to get enough deep sleep. So you'd better tum off smartphones, TVs, and all other screens an hour before your bedtime.
⑤To keep healthy, doctors and researchers strongly advise that you shouldn't use screes for long hours.
