Are you suffering from insomnia （失眠） now? It’s true that many people are deeply bothered by insomnia. ___27___ Sleep expert Michael Grandner offers top three tips.
Make a plan and stick to it.
Melatonin （褪黑素） is produced by the body to control when you get sleepy and when you wake up. As night falls, the levels of melatonin rise, becoming a signal to the body that it’s time for bed. And the levels naturally fall as daylight comes near, getting you ready to greet the day.
___28___ So if your bedtime and wake-up time change from day to day, your body doesn’t know how to react. So it’s important to have a regular bedtime and wake-up time, even on weekends.
___29___
In fact, this tip is so powerful that it can even beat sleep medicine. “Whenever you’ve been awake for 20 or 30 minutes, either the beginning or the middle of the night, get up. Maybe you just need five minutes to get sleepy, or maybe an hour, but don’t spend that time in bed,” says Grandner.
Change your attitude about sleep.
Many people see sleeping as the final thing they have to do in a busy day, worth delaying to catch up on housework, schoolwork or others. ___30___ “See your sleep as the amount of time you need in order to set yourself up for a productive tomorrow. It may sound like a small change, but it’s an important one,” Grandner adds.
根据短文内容，从下列选项中选出能填入文中空白处的最佳选项，选项中有一项为多余选项。
A ． Don’t lie in bed awake.
B ． Take some medicine if you need.
C ． That thought needs to be changed.
D ． In fact, we can train our brain to fall asleep.
E ． The release （释放） of melatonin needs to be at regular times.
D 28 ． E 29 ． A 30 ． C
【导语】本文介绍了预防失眠的方法。
27 ．根据 “It’s true that many people are deeply bothered by insomnia” 及 “Sleep expert Michael Grandner offers top three tips” 可知，事实我们可以改变这种情况， D 选项 “ 事实上，我们可以训练我们的大脑入睡 ” 符合语境，故选 D 。
28 ．根据 “So if your bedtime and wake-up time change from day to day, your body doesn’t know how to react” 可知，此处提到了 “ 有规律的时间 ” ， E 选项 “ 褪黑激素的释放需要定期进行 ” 符合语境，故选 E 。
29 ．根据 “but don’t spend that time in bed” 可知，本段的建议是醒着的时候不要躺在床上， A 选项 “ 别躺在床上而不入睡 ” 符合语境，故选 A 。
30 ．根据 “Change your attitude about sleep” 可知，要改变自己的某些想法， C 选项 “ 那个想法需要改变 ” 符合语境，故选 C 。
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