My son also had the sleep walking. It was due to the abuse at home, I later learned. I agree with Michelle in that you may want to send him to therapy to help him with what he struggles with internally.
Hi, hopefields and welcome to Bella!
Children manifest emotions in many ways because in some stages of development, they are not capable of expressing their feelings in a way that adults will understand. During my divorce, which was quite ugly, my oldest developed night terrors, stomach aches and headaches and my youngest regressed to wetting the bed.
Keep an eye on things, but try not to make a big deal out of it either. This can cause your son to focus more on the problem and it may escalate. If professional help is needed, let the professional worry about treatment.
Just concentrate on loving your son and letting him know that he can trust and depend on you.