There you were, so focused on doing this damned scientific paper, when she suddenly butts in and asks you if you're not sleepy yet. You tell her not yet.
And then she mutters how comfy and inviting her bed seems tonight and how great that she can sleep early because she doesn't have anything to do tomorrow.
You let her be and wished her good night. She walks around coughing and sneezing without covering her mouth. Seriously, the last thing I need now is some illness brought by contamination.