How much sleep do we need? We are all different. Some people need only three hours of sleep a night. 1 need ten hours of sleep a night. After age fifty, the average (平均) sleep time goes 2 to 6.5 hours a night. Most of people have a night when they can't sleep. About one in three Americans has a problem with 3 Many of these people 4 fall sleep. This is not 5_ problem. Many famous people 6 could not fall asleep. Some of these people had their own ways to make them sleep. Benjamin Franklin, the famous statesman and inventor had four 7 . He 8 from one to the other to fall asleep. King Lois XIV of France has 413 beds and hoped _ 9_ asleep in one of them Mark Twain, the famous American writer, had a different way. He lay 10 _ his side across the end of the bed!