B.C.
It's fairly common and most kids out grow it before they are 15.
A very few continue to sleep walk as adults.
Ask your parents and your in laws if other family members walked in their sleep as kids.
It tends to run in families.
I talk in my sleep - I never out grew it.
When I was in school in chorus, my Mom says she use to hear me sing in my sleep.
My husband has had some interesting conversations with me over the years and he tells me about them in the morning.
Apparently one night while I was fast asleep I pointed to the window and told him the seals were coming - they were following the wire.
He says he can keep me chatting for almost 20 min at a time and sometimes the stories are pretty good.
I never remember anything about it.