Jack is an 11-year-old boy. One day he was playing with a ball. The ball went into the street, and Jack ran for the ball. A car hit him. Jack's parents took him to the hospital. The doctors told them, "Jack's head is hurt. Maybe he will wake up very soon. Maybe he will never wake up." Every day Jack's parents went to see him and talked to him. But Jack never talked to them. He just slept. One day Jack's father said, "Wake up, Jack. Let's go home and play with Cody." Cody is Jack's dog. When Jack's father said "Cody", Jack moved his arm. Then Jack's parents had an idea. They told the nurse, "We want to bring Jack's dog to the hospital. Is it OK?" "A dog in the hospital?" the nurse said. "That's very unusual. But. yes, it's OK." The next day, Jack's parents brought Cody to the hospital. When they put the dog on Jack's bed, Jack opened his eyes. Jack's parents brought Cody to the hospital every day. Cody jumped on Jack's bed and touched Jack's arm. Jack said his first words, "Bad dog!" After seven weeks Jack was well. He left the hospital and went home with Cody. What was Jack's problem?
He couldn't get to sleep. He couldn't sleep well. He couldn't wake up. He couldn't walk