(单选题)
Which of the following means that you sleep well?
A.You feel tired after getting up.
B.You can fall asleep within 20 minutes.
C.You wake up several times during the night.
D.You often do something boring until you feel sleepy.
参考答案：B
参考解析：
细节理解题。根据第四段第一句“If people often wake up during the night, or always feel weak and tired in the day, they should pay attention to their sleep pattern”，可以判断ACD都是睡眠不好的体现。故选B。
知识点：
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