Sleep-Walker

So last night, at around 2 AM, I heard Brooklyn and Bailey's door open and shut to their room. I heard Bailey talking for a minute and then I heard some whining. I woke up Cody and told him to go check on the girls. He got up and then laid right back down. I asked him why he didn't go, he said he didn't hear anything. So I tried to go back to sleep, but I kept having horrible thoughts about Bailey going outside and getting lost or hurt. So I finally got up myself to go check on them. At this point it had been about 5 minutes since I heard the door open and close. When I reached the hall I had quite a fright, Bailey was just standing there. She didn't say a word to me until I picked her up and asked her what she was doing. She blabbed something to me about my room and then she asked me where Brooklyn was. I walked back into her room, where Brooklyn was sprawled out on both of their beds. I moved her and put them both back into bed. It was so strange that Bailey would just stand there and not come in our room to get us and also shut her door after she left her room, she would normally just leave it open. So this is why I think she was sleep walking. I have also gone into check on them another time and Bailey was sleeping at the side of her bed. She was standing next to the bed with her head laid on it. We are going to have to watch out for this one.