Sleepover Sleeping Arrangements

The girls had friends spend Friday night. I decided to shut down the fun about midnight. I walked into the brunette twin's room to find all four girls sitting on the brunette twin's bed. In the middle Holly was sleeping with a pillow under her head.
While we were talking about Saturday's adventures, Erin looked at Anna and said, "Where are you sleeping?" Anna replied, "I don't know."
I said, "What do you mean? You're sleeping in this bed. The dog can sleep on the floor."
All four girls looked at me like I was crazy. I reiterated that the dog was not sleeping in Anna's spot. Holly might join Anna and Ally, but Anna was not sleeping on the floor so Holly could sleep in the bed.
The four girls finally went to sleep in the correct places. Holly decided to crawl into the blond twin's bed. When I went to bed everyone was sleeping happily.