Explanation for the Piles of Lumps

We have been baffled by how many times Alyssa can make the piles of lumps all over the floor and enjoy doing it so much.  She was doing it again today and Sam figured out what it is that she's really doing.  At school, all of the kids take naps on mats on the floor.  The teacher must walk around the room giving each kid their blanket for naptime.  Alyssa is playing the teacher.  She is putting all of the kids (dollies, animals, etc.) down for a nap.  She is telling them to go to sleep.  She's just role playing.  I would have never guessed.  Sam finally figured it out.  I just fold the blankets and put them away for next time.