英語四級完型填空練習

　　Do you wake up every day feeling too tired, or even upset? If so, then a new alarm clock could be just for you.

　　The clock, called SleepSmart, measures your sleep cycle, and waits __1__ you to be in your lightest phase of sleep __2__ rousing you. Its makers say that should __3__ you wake up feeling refreshed every morning.

　　As you sleep you pass __4__ a sequence of sleep states―light sleep, deep sleep and REM sleep―that __5__ approximately every 90 minutes. The point in that cycle at which you wake can __6__ how you feel later, and may __7__ have a greater impact than how much or little you have slept. Being roused during a light phase __8__ you are more likely to wake up energetic.

　　SleepSmart __9__ the distinct pattern of brain waves __10__ during each phase of sleep, via a headband equipped __11__ electrodes and a microprocessor. This measures the electrical activity of the wearers brain, in much the __12__ way as some machines used for medical and research __13__, and communicates wirelessly with a clock unit near the bed. You __14__ the clock with the latest time at __15__ you want to be wakened, and it __16__ duly wakes you during the last light sleep phase before that.

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