Sleep walking??

I think Princess sleep walks. I remember in CA she came out of her room at night a couple of times, wouldn't respond to questions, and talked nonsense.

She just came out of her room, came and sat in the seat next to be at the computer, and gibbered about getting a picture. Then she got a drink of water and headed to bed. I said "goodnight" at her, and she didn't even flinch in response. She never remembers these things the next day.

Is that sleep walking??