When my stepdaughter was 8 she had night terrors. She also tended to sleep walk. As it turns out, her tonsils were overly large and would obstruct her airway when she slept, resulting in sleep apnea. In children, the symptoms of sleep apnea include snoring, sleeping in (what we would consider uncomfortable) positions, night terrors and sleep walking. Ask your pediatrician if your son's tonsils might be enlarged. There is a strong connection between enlarged tonsils, sleep apnea, and behavior problems (ADHD-like, resulting from sleep deprivation...the body does not rest during terrors, sleep walking, etc. even if the child is not awake.) My stepdaughter had to have them removed, and we haven't had the problem since. Granted, there are lots of night terrors that are just a developemental stage and resolve on their own. But I would check just to be safe, especially if they don't get better.