根据短文内容，判断正（T）误（F）。 How much sleep do we need? We are all different. Some people need only three or four hours of sleep a night. Others need ten hours of sleep a night. Most Americans sleep an average of seven to eight hours a night. After age fifty, the average sleep time goes down 6.5 hours a night. Most people have a night when they cannot sleep. About one in three Americans has a problem with sleep .Many of these people cannot fall asleep. The name of this problem is insomnia. This is not a new problem. Many famous people in history had insomnia. Some of these people had special ideas to make them sleep. Benjamin Franklin, the famous statesman and inventor, had four beds. He moved from bed to bed to fall asleep. King Louis of France had 413 beds and hoped to fall asleep in one of them. Mark Twain, the famous American writer ,had a different way. He lay on his side across the end of his bed! (     )1. We all need eight hours of sleep a night. (     )2. Most Americans sleep 7 to 8 hours a night. (     )3. If a person has insomnia he can never fall asleep. (     )4. Benjamin liked to move beds. (     )5. The title of this passage may be 'Sleep'.