It doesn't matter when or how long a person sleeps, but everyone needs some rest to stay alive. That's what all doctors' thought, until they heard about Jerry Page. Jerry Page, it was said, never slept. Could this be true? The doctors decided to see this strange man by themselves. Jerry Page was ninety years old when the doctors came to his home in New Jersey. They thought for sure that he got some sleep of some kind. So they stayed with him and watched every movement he made. But they were surprised. Though they watched him hour after hour and day after day, they never saw Jerry Page sleeping. Actually, he did not even own a bed. He never needed one. The only rest that Jerry Page got was sitting in a comfortable chair and reading newspapers. The doctors were puzzled by this strange continuous sleeplessness. They asked him many questions, hoping to find an answer. They found only one answer that might explain his condition. Page remembered some talk about his mother having been injured several days before he was born. But that was all. Was this the real reason? No one could be sure. The main idea of this passage is that _________.