Bedtime games

Katherine (5) and Elizabeth (2), who share a room, have been up very late the past couple of weeks. We put them to bed around 8:00 and they haven't been going to sleep until close to 10:00 on most nights, or even later. What are they doing up there? Well, we have the monitor on so we do hear what they are doing. They aren't roughousing or being crazy. They, for the most part, stay in their respective beds and have made up games that they play. The most recent are "who's birthday is it" where they sing Happy Birthday to each of the stuffed animals/dolls in their beds and "Campsite" where they use the books that they have to make tents for their animals and dolls. While we wish they would go to sleep earlier, they are sleeping later in the morning which is nice for me and it is fun to listen to thier conversations. I know they are forming a nice friendship and hope that the sisterly bond lasts a lifetime.