sleepwalker?

Last night I had something pretty odd happen. I got up in the middle of the night and I think I was sleep walking because I got all disoriented while using the bathroom (that is what I ended up doing any way). I didn't know which doors upstairs lead to where and the house didn't feel like it was the right size. Not much else to say about it, because I don't remember any more details. It was a partially wakened state, and I was able to fall back asleep right away after I found my bed again. I can still remember it happening, but it's striking me as so not like me and it's a bit disturbing. Hopefully it was just an odd one time thing but still wishing we knew what caused it.