Regression
One of the big perks of the new house was that the girls would each have their own bedrooms for the first time. So, when we moved in, they got their own rooms, right across the hall from each other. Large immediately took to hers, arranged the furniture herself, and rearranges it every week or so (she has a strong intuitive understanding of feng shui). Small did not fare quite so well, and hates being by herself in her own room at night. She's used to always having her big sister around. She complains of stomach aches, monsters, ghosts.
Well. They've decided - on their own - to share a bedroom again. Which is odd, as they tend to fight like wolverines during the day. But so be it: both beds are now in one bedroom, and the other has been designated as the play room. It's only been a couple days. But while they still fight during the day, over toys, over territory, over the very air that they breathe, they seem extremely comforted by the idea that at the end of the day, when the lights go out, they won't be alone.