It could be hereditary. As a child I used to sleep walk. I remember a housekeeper finding me tottering at the top of the stairs, and she gently redirected me back to bed. Another time I woke up in bed with one of the other sibliings, across the hall from my room. When I first awoke, I though we might have had late night house guests and my Dad might have carried me across the hall to my sibs room to free up my bed for guests. When I asked him in the morning, he said "no, we didn't have guests last night."Now I hear people calling out my name in my sleep, I'll get up and
open my bedroom door and call out, "What do you want". No answer. Then I go check on whoever is here and they are sound asleep with white noise machines running. We have very different sleep/wake cycles in this house. I'm in my PJ's at 7 PM, my son stays up till 12, or 1, or 2AM. I wake up between 5 and 6, and my son gets up at 11 or 12, PM. So everybody gets along great cause we only see each other in the afternoons. The hereditary thing, my Biological Mother, yells, has complete conversations, and walks in her sleep, usually out to kitchen for food or drink. I've seen her bake a cake and wash dishes in a semi-conscious state. I don't know what she's up to these days, we don't speak. Unfortunately, there is a lot of conflict through-out our family, for generations.