系统解析:B 细节理解题。根据第三段中提到King Louis XI V (国王路易十四) of France had four hundred and thirteen beds and hoped to fall asleep in one of them他是法国人可得知A错误。根据第三段提到Many famous people in history had insomnia, too.许多名人也会失眠故B项正确。Benjamin Franklin, the famous inventor, had four beds. He moved(移动) from one to another to fall asleep.他是个著名的发明家,而不是作家,故C项错误。根据第一段提到Benjamin Franklin, the famous inventor, had four beds. He moved(移动) from one to another to fall asleep.50岁以后才会睡眠6.5小时故D项错误。