Read and answer the questions. (根据短文内容回答下列问题。)
A businessman had worked too much. He found that he couldn't sleep at night, but often fell asleep
in the day. He became very worried, so he went to see his doctor.
"Can you help me, doctor?" he asked. I slept so well, but now I slept less than two hours at night.
The doctor looked him very carefully, gave him some tests, asked him to work less hard, and told
him to take some medicine to help him. He said he was sure that he was not seriously ill, and that he
would soon be better.
But the businessman grew worse instead of better. He slept even less than before at night and was
still falling asleep in his office. He visited the doctor again and again and it took the doctor a long time
to find out the reason: the businessman's wife was giving him the sleeping medicine in the morning and
the ones to keep him awake at night.
1．Why couldn't the businessman sleep at night?
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2．How long does he sleep now at night?
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3．Did the doctor think the businessman had a serious problem?
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4．Did the businessman grow worse or better after seeing the doctor?
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5．Was the doctor able to find the real reason for the business's problem?
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6．Who was responsible for the businessman's problem?
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