My older son had them, but at a younger age - around 2 or 3. As he got older he had some sleepwalking, but not a lot.
My younger son didn't have the night terrors as bad, but he has always been very active in his sleep. He did the sleepwalking, too. He also wet the bed until age 7.
I just want you to know that they both outgrew it, and that this will pass. It is more common in boys.
If he does start sleepwalking, be prepared for him to pee in weird places. lol When my oldest started sleepwalking, I had my computer in the kitchen, and he walked into the kitchen where I was. I didn't realize he was sleepwalking right away, and told him to get back to bed. I turned around and he was peeing on the kitchen rug! lol After that if he got up I would lead him to the bathroom and stand him in front of the toilet, and hold on to his elbow to guide his aim.
My younger one got up one night, and my DH led him back to his bed. I asked him if he'd taken him to the bathroom first he said, no he went right back to bed. I heard him in there giggling and I said "well he just peed on the floor" He pulled down his pullup and peed on the floor, which was covered with those foam alphabet puzzle pieces. I still get nervous when I hear him giggle in his sleep, but he seems to have outgrown that part.