Just tell her off about it, No need to overreact.
From Create Your Own Story
You are understandably mildly peeved about this, but she is still your sister and you are still the heir, and the heir cannot let small things get to them!
"Anna! Go back to sleep!" you say to her as gently as your rather miffed state allows.
"But I want to play! Come on, Elsa!"
Damnit, Anna... what's the plan now?
