Kenzie Climbs out of her Bed

So one morning of course Morgan made her way to our bed in the middle of the night she was just awaking when we heard little Ms. Kenzie singing away in her room. I sent Drew to go grab her and when he walked to her bed he didn't see her.. a little panic mode sent in as this was not typical .. He found her curled up on her bathroom rug laying on her belly. Thank goodness there were no broken bones. We are totally baffled as she has never done it again and we have no idea how she was able to get out in the first place.