A young man couldn't sleep well every night. He was very worried. One day he went to see the doctor. The doctor looked him over carefully. But nothing wrong with him. The doctor told him to count from 1 to 10 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 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 answered. “But every time when I reached eight, I couldn't help jumping from bed.”

    “But why?” the doctor wanted to know. The young man said, “I am a boxer.”(拳击运动员)

根据短文内容完成下列句子。