Thanks for the replies. That's interesting.
I have gone to great lengths to make them comfortable in their room. I got them posters, but none could have faces, even drawn puppy faces, because my dd is afraid of pictures of faces. I got a big, heavy tapestry to put over the window so that nobody could see in. I just spruced it up. My kids are scared of vents and I covered the vents in their room and the bathroom (these vents are old and don't work now) with posters. I closed the closet. I put a TV in there so that they could have noise to fall asleep to.
Nope. Too scary.
So, I said that I would take that room and they could share mine.
Nope. They wanted to sleep in there with me!
In a few years, they'll be adult sized. And we'll all be sleeping together. I swear, if they get married someday, that's where I draw the line!