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阅读下面短文,根据其内容写一篇 60 词左右的内容概要。

For many parents,making sure their children get the right amount of sleep can be stressful.This is especially true during high-pressure times such as exams when students tend to study all night for the next day.Unfortunately,it is often counterproductive(适得其反的)because with fewer hours to sleep,the teen brain doesn't get enough time to lay down what they've studied the night before.

In her groundbreaking book The Teenage Brain,neuroscientist Dr.Frances Jensen explains that bedtime isn't simply a way for the body to relax and recover after working,studying or playing a hard day. It is the glue that allows us not only to recollect our experiences but also to remember everything we've learned that day.Basically the more we learn,the more we need to sleep,which is why a good sleep is of great importance in achieving success at school.

Then how much sleep do teenagers need?There is no magic number for exactly how much sleep teenagers need,but the Austrian Centre for Education in Sleep(ACES)suggests 8 to 10 hours per day for high school adolescents.What happens if they don't get enough sleep?According to ACES,poor sleep will have all sorts of negative effects on teenagers,including rise in blood pressure,mood swings and impatient behaviours.Without adequate sleep the focus and attention drifts making it harder to receive information. The brain can no longer function to deal with information properly and access previously learned information.

So,how can parents help?If you think your child needs more sleep,try making gradual changes to their sleeping habits.Small increases have been shown to be effective in changing sleep patterns.And remember your children are going through a period of their lives when their brains and bodies are going through a lot of changes.Not only is your job to help make changes,it's also to ride the wave with them.It may not be easy,but they will thank you for it eventually.

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