Scientists' Insight into Sleepyheads

Recently, scientists have carried out a number of studies that shed light on sleeping problems. A study showed that children between the ages of 2.5 and 6 should get ten hours of sleep each night. Those who got less sleep performed poorly on tests of their language ability and intellectual development.
Another study found that 60% of teenagers in Belgium used their cell phones either to talk or to send text messages after turning their lights out at bedtime. If they simply stop using cell phones before sleeping, they can stay alert in class. Another study showed that adults who overwork themselves lose sleep. For every half hour of extra time spent at work, adults lose one hour of sleep on average This means that employees who regularly work just 1.5 hours of overtime per weekday only get 4.5 hours of sleep.
It all comes down to one piece of advice: Stay at your best, and get enough rest!

1.Summarize what the article is talking about:

There are three studies in this article. One is that children should get ten hours of sleep; another one is that teenagers should sleep without playing cell phones; the other one is that adults shouldn't overwork. All of them are relative to sleeping problems.

2.Write down any vocabulary words or phrases that you think:

i. Are difficult or you new to you: 1)shed light on 2)comes down to
ii. Are probably useful for you to learn/know: This means that employees who regularly work just 1.5 hours of overtime per weekday only get 4.5 hours of sleep.


3.Say why you chose this article and how it relates to your life, your experience, you desires, etc:
Recently, I've not been sleeping well for many days. I either did my homework or couldn't sleep. Even though I know that sleeping is very important. These studies are valid, but I think that if you sleep less, not only your intellectual development and language ability but your health will decrease and get worst. So, stay at your best, and get enough rest!