阅读短文，回答问题。
A young man could not sleep well every night. He was very worried. One day, he went to see the doctor.
The doctor looked him over carefully. But there was nothing wrong with him. The doctor told him to count
from one to ten again and again. "Keep doing it until you fall asleep," the doctor said.
After a few days, the young man came to the doctor again. But to his surprise, the doctor r found the
young man was even worse than before.
"Didn't you count as I told you?" the doctor asked.
"Yes, I did," the young man said, "But every time when I reached eight, I could not help jumping (情不自禁
地跳起来) from bed."
"But why?" the doctor wanted to know. The young man answered, "I am a boxer (拳击运动员)."
1.Why did the young man have to go to see the doctor?
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2.Was there anything wrong with the young man?
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3.What did the doctor tell the young man to do?
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4.Why did the young man come to see the doctor again?
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5.Why could the young man not help jumping from bed when he reached eight?
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