By the time Anna steps from the shower, barely half an hour has passed. It doesn't seem like that long, but evidently Elsa was absolutely exhausted because she's fallen asleep again.
This is bad. It's uncharted territory. Does Anna wake her up and ask to sleep next to her? Just go to her own bedroom? She leans against the doorframe, weighing her options. Elsa shifts, mumbling in her sleep. Her arm spreads out over the empty half, searching for something.
Anna smiles softly. She knows the answer now, and she can't believe she ever doubted it.