Many people use the mobile phones as the alarm clocks and are used to checking e-mails before sleeping.
Many years ago, my boss stayed up playing on her mobile phone and got badly ill because ofthat. Now she always leaves her phone in another room at night. And she encouraged her friends to do so. "I sent each of my friends the same Christmas gift-an alarm clock. So they could stop using the phones as the alarm clocks, "she said.
If your mobile phone wakes you up in the morning, it may also keep you up at night. A study shows that people in mobile phone radiation(辐射)mostly have sleeping problems. And according to a Swedish study, a quarter of young people in this country feel like having their phones around them. Most of them feel sorry for not replying to messages. So they even have to reply to their friends before sleeping.
A recent study has shown that three quarters of people aged between 18 and 34 prefer to sleep with their phones near them. That number falls off a little in the middle age, but only people aged 65 and older like leaving the phones in another room while sleeping.
