题目内容：
根据下面材料，回答题。 Sleep-Smart
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 Sleep-Smart, measures your sleep cycle, and waits ____51____ you to be in your lightest phase of sleep before arousing you. Its makers say that should ____52 ____you wake up feeling refreshed every morning.
As you sleep you pass through a sequence of sleep states- light sleep, deep sleep and REM (rapid eye movement) sleep--that ____53____ approximately every 90 minutes. The point in that cycle at which you wake can ____54____ how you feel later, and may even have a greater impact than how much or little you have slept. Being aroused during a light phase ____55 ____you are more likely to wake up energetic.
Sleep-Smart ____56____ the distinct pattern of brain waves produced during each phase of sleep,via a headband equipped ____57____ electrodes (电极) and a microprocessor. This measures the electrical activity of the wearer's brain, in much the ____58____ way as some machines used for medical and research ____59____, and communicates wirelessly with a clock unit near the bed. You ____60____ the clock with the latest time at ____61____ you want to be wakened, and it then duly (适时地) wakes you during the sleep phase before that.
The____ 62____ was invented by a group of students at Brown University in Rhode Island ____63____ a friend complained of waking up tired and performing poorly on a test. " ____64____ sleep-deprived (剥夺)people, we started thinking of ____65____ to do about it," says Eric Shashoua, a recent college graduate and now chief executive officer of Axon Sleep Research Laboratories, a company created by the students to develop their idea.
_____________ A．beside
B．near
C．for
D．around
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