judywald:

(From linked site:)”There was a very good reason Christopher was strapped into bed - he had a terrible sleep walking problem and he actually almost fell down a flight of stairs because of his sleepwalking. Joan went to a doctor about this problem and the doctor gave Joan the bed harness. This is why Christopher was strapped into the bed. Joan had a hard time sleeping because she was so worried Christopher was going to get up during the night, sleepwalking, and harm himself. It was all good intentions from Joan - I am sure Christina saw this and was horrified her “little brother” was being strapped into the bed.”