Do other kids do this too?

Sometimes I look at my children and I wonder to myself, "are my kids strange or do other kids do that stuff too?" It seems the most often time I ask myself this is when they decide to play sleep. Yes, they like to play like they are sleeping, and this pretty much happens everyday. They will drag their blankets, pillows, favorite stuffed animals and babies of every shape and size and lay on the living room floor and pretend like they are sleeping. They just lay there with their eyes closed and a smile on their face like it's the most fun in the world.  I most often find this strange when they decide that the grand fort I just built in the living room for them to play in would make a really great place to sleep, and out come the before mentioned sleeping accessories. It kind of bothers me because I did not spend all that time finding blankets and dragging the dining room table into the living room and listening to Connor tell me the best way to make the fort, so they could sleep. This also happens when I bring the Thomas the train tent and the princess castle tent  into the living room. Everything is a bed for them.

Sometimes they will be in Livvie's room and I will wonder why it's so quiet back there and think that they must be doing something they shouldn't be doing, but no, they are laying on the floor, pretending to sleep. I just don't get it. I don't think I ever played "sleep" when I was little. This has to be my fault because they must hear me talk about how much I love to sleep and how I treasure my naps. They probably think that if mom loves to sleep so much then it must be the thing to do. I guess I should just be happy that they aren't terrorizing my house.