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    Dreams can happen in any of the four stages of sleep. The most memorable and clearest dreams happen in the last stage of sleep (also known as REM sleep). The sleep cycle repeats about four to five times every night. So you can see how a person has several different dreams in one night. Most people only remember dreams that happen closer to the morning when they are about to wake up. That you can’t remember those dreams does not mean they never happened.
    The stages in the sleep cycle are organized by the changes in different brain activities.

    Stage 1: You are entering into light sleep. In this stage, your eyes move rapidly. We call this NREM. The body gets relaxed and your body temperature lowers. Your heart rate lowers, too. The body is preparing to enter into deep sleep.
    Stage 2: Also characterized by NREM. In this stage, the body temperature and heart rate drop again. You are completely asleep.
    Stage 3: Still in the NREM stage, this is a deeper sleep still.
    Stage 4: In this stage of sleep, your eyes move back or forward. We call it REM sleep. This stage happens at about 90-100 minutes after the beginning of sleep. Your blood pressure rises, heart rate speeds up. The majority of your dreams happen in this stage.
    These stages repeat themselves throughout a night’s sleep.
    小题1: Dreams can happen in ___________.
    A. Stage 1 and 2           B. Stage 3 and 4            C. every stage
    小题2:Which of the following sentences is TRUE according to the passage?
    A. These stages will happen once or twice one night.
    B. Most people only remember the dreams that happen when they are about to wake up.
    C. If one can’t remember his dreams, he never dreams at all.
    小题3:What will happen in Stage 2?
    A. Eyes move rapidly.   B. People enter into light sleep.    C. Heart rate drops.
    小题4:The first REM sleep happens about ___________ after the starting of sleep.
    A. 1 to 2 hours                     B. 2 to 3 hours                     C. 10 minutes
    小题5:The passage is mainly about ___________.
    A. the stages of sleep     B. types of dreams         C. remembering dreams

    小题1:C
    小题2:B
    小题3:C
    小题4:A
    小题5:A

    小题1:本文第一句提到梦可能会发生在睡眠4个阶段当中的任何一个阶段，故本题选C。
    小题2:本文第四行提到绝大多数人都能记住快要醒时所做的梦，故B项是正确的，故本题选B。
    小题3:睡眠的第一阶段人进入浅睡眠状态，眼睛跳动的快，睡眠的第二阶段人完全睡着了，体温和心率下降，故本题选C。
    小题4:从图表上可以看到人睡眠的第一阶段大概发生在人睡觉后的1到2小时，故本题选A。
    小题5:本文主要谈论了人睡觉时的四个阶段，故本题选A。
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