1 . In the digital age, we rely on technology such as social media in trying to build interesting and varied lives. Social networking sites like Facebook are designed and promoted to make us believe enthusiastically that they are able to open up new experiences for us. There are constant notifications (通知) and updates, urging us to check-in to find out what is new.

But if we do not use the technology wisely, we can end up becoming overly attached and trapped in a cycle of social media FOMO, a sign of deeper unhappiness. FOMO, or fear of missing out, is a fear that exciting or interesting events are happening somewhere else and that we are not able to join.

People who experience high levels of FOMO have been found to be more likely to give in to urges to write and check text messages while driving, as well as to use Facebook more often directly after waking, while going to sleep and during meals.

When it comes to lasting happiness, it is best not to give in to FOMO, but rather to deal with the cycle of desires that fuel it. Hard as it is, we are better off working toward facing the fearful reality that we cannot experience everything we might like than to get caught in a cycle of checking behaviors that only cause anxiety.

If we have become used to using social media as part of our attempts at living interesting lives, we must admit that it is not easy to change our approach. But change is almost always worthwhile in the long run.

The fact that FOMO is so common in our digital age is a sign that there is something wrong with the way we are pursuing happiness and that we are not as happy as we might think we are. It should warn us that, in our eagerness to use digital technology to try to make ourselves happier, we may unintentionally (无意之中) be bringing on exactly the opposite result.

3 . Getting less sleep has become a bad habit for most American kids. According to a new survey(调查) by the National Sleep Foundation, 51% of kids aged 10 to 18 go to bed at 10 pm or later on school nights, even though they have to get up early. Last year the Foundation reported that nearly 60% of 7- to 12-year-olds said they felt tired during the day, and 15% said they had fallen asleep at school.

How much sleep you need depends a lot on your age. Babies need a lot of rest: most of them sleep about 18 hours a day! Adults need about eight hours. For most school-age children, ten hours is ideal(理想的). But the new National Sleep Foundation survey found that 35% of 10- to 12-year-olds get only seven or eight hours. And guess what almost half of the surveyed kids said they do before bedtime? Watch TV.

“More children are going to bed with TVs on, and there are more opportunities(机会) to stay awake, with more homework, the Internet and the phone,” says Dr. Mary Carskadon, a sleep researcher at Brown University Medical School. She says these activities at bedtime can get kids all excited and make it hard for them to calm down and sleep. Other experts say part of the problem is chemical. Changing levels of body chemicals called hormones not only make teenagers’ bodies develop adult characteristics, but also make it hard for teenagers to fall asleep before 11 pm.

Because sleepiness is such a problem for teenagers, some school districts have decided to start high school classes later than they used to. Three years ago, schools in Edina, Minnesota, changed the start time from 7:25 am to 8:30 am. Students, parents and teachers are pleased with the results.