5、Are you a real bad – tempered person in the mornings? Do you wake up every day feeling tired, angry and upset, and easy to become sleepy again? If so, then a new alarm clock could be just for you.

The clock, called Sleep Smart, measures your sleep cycle, and waits for you to be in your lightest phase （阶段） of sleep before waking you up. Its makers say that should ensure you wake up feeling refreshed every morning.

As you sleep, you pass through a sequence of sleep states, light sleep, deep sleep and REM sleep, and that repeats approximately every 90 minutes. The points in that cycle at which you wake can affect how you feel later, and may even have a greater impact than how long or little you have slept. Being wakened during a light phase means you are more likely to wake up cheerful and full of life and interest.

Sleep Smart records the distinct pattern of brain waves produced during each phase of sleep, via a headband（头箍） equipped with electrodes and a microprocessor. This measures the electrical activity of the wearer's brain, in much the same way as some machines used for medical and research , and communicates wirelessly with a clock unit near the bed. You program the clock with the latest time at which you want to be wakened, and it then duly wakes you during the last light sleep phase before that.

The concept was invented by a group of students at Brown University in Rhode Island after a friend complained of waking up tried and performing poorly on a test. “As sleep－deprived （剥夺） people ourselves, we started thinking of what to do about it,” says Eric, a recent college graduate and now chief executive officer of Axon Sleep Research Laboratories, a company created by the students to develop their idea. They have almost finished the design and the production experiment and plan to market it by next year.

1．Sleep Smart is a clock that           .

       A．enables you to go to sleep                     B．wakes you up at the proper time

       C．helps you to get up early                       D．makes you sleep in a light phase

2．As you sleep, the headband        .

      A．analyses your sleep cycle every 90 minutes

       B．records the time when you fall into deep sleep

       C．communicates wirelessly with a computer

       D．measures the electric activity of your brain

3．To make the device Sleep Smart work, the sleeper should       .

      A．keep himself keep in light sleep              B．turn on the recorder

       C．set the latest time for waking up            D．adjust his headband well

4．The idea of making such a clock was thought of by       .

      A．some students at brown University

       B．a sleep – deprived person in Rhode Island

       C．some college graduates and a chief officer

       D．the researchers at Axon Sleep Research Laboratories