It doesn't matter when or{{U}} (41)
{{/U}}a person sleeps, but everyone needs some rest to stay alive. That's{{U}}
(42) {{/U}}all doctors thought, until they heard about Al Herpin.
People said he never{{U}} (43) {{/U}}. Could this be true? The doctors
decided to see this strange man{{U}} (44) {{/U}}. Al Herpin was 90 years
old when doctors went to his home. They{{U}} (45) {{/U}}that he got some
sleep of some kind. So they stayed with him and watched him. But they were{{U}}
(46) {{/U}}Though they watched him hour{{U}} (47) {{/U}}hour
and day after day, they never saw Herpin sleeping. In fact, he did not even have
a bed. He never needed one. The only rest he got was{{U}} (48) {{/U}}in
a chair and reading newspapers. The doctors were puzzled (疑惑) by this strange
sleeplessness. They asked him many questions,{{U}} (49) {{/U}}to find an
answer. They found only one answer that might{{U}} (50) {{/U}}this.
Herpin's mother was injured (受伤) several days before he was born. But that was
all. Was that the real reason? Nobody could answer the
question.