There is an endless supply of stories about sleepwalkers . People have been said to climb on roofs, solve mathematical problems, write music, walk through windows, and do murder in their sleep. In Revere, Massachusetts, a hundred policemen searched for a lost boy who left his home in his sleep and woke up five hours later on a strange sofa in a strange living room, with no idea how he had got there. At the University of Lowa, a student was reported to have the habit of getting up in the middle of the night and walking three-quarters of a mile to the Lowa River. He would take a swim and then go back to his room to bed. An American expert on sleep claims  that he has never seen a sleepwalker. He is said to know more about sleep than any other living man, and during the last thirty-five years he has lost a lot of sleep watching people sleep. He says, "Of course, I know that there are sleepwalkers because I have read about them in the newspapers. But none of my sleepers ever walked, and if I were to advertise for sleepwalkers for an experiment, I doubt whether I would get many takers ." Sleepwalking, however, is a scientific reality. It is one of those strange things that sometimes look quite fantastic . Doctors say that sleepwalking is much more common than is generally supposed. Many sleepwalkers do not try to find help and their sleepwalking is never recorded. It was reported that a boy   _  .
was found on a strange sofa, telling how he had got there lost his way five hours after he left home slept in his own room but woke up in a strange room was searched for by policemen when he lost his way