My #4 son always had a tendency to sleepwalk. I found him one night mistaking his little brother's toy box for the pot! It took some work to clean up , but no serious harm. It subsided for a while, then came back when he was about 13. This time it was more worrisome because he was waking up outside. After a little study, we found the trigger. He had developed an interest in the old "Zorro" tv show and bought videos. He watched an episode each night before bed. I can't explain it, but no more "Zorro" - no more sleepwalking.