because I could see there was something strange about the situation

The song was almost over when something made me realise I wasn't alone, and I opened my eyes to find myself staring at Madame framed in the doorway.
I froze in shock. Then within a second or two, I began to feel a new kind of alarm, because I could see there was something strange about the situation. The door was almost half open--it was a sort of rule we couldn't close dorm doors completely except for when we were sleeping--but Madame hadn't nearly come up to the threshold. She was out in the corridor, standing very still, her head angled to one side to give her a view of what I was doing inside. And the odd thing was she was crying. It might even have been one of her sobs that had come through the song to jerk me out of my dream.
When I think about this now, it seems to me, even if she wasn't a guardian, she was the adult, and she should have said or done something, even if it was just to tell me off. Then I'd have known how to behave. But she just went on standing out there, sobbing and sobbing, staring at me through the doorway with that same look in her eyes she always had when she looked at us, like she was seeing something that gave her the creeps. Except this time there was something else, something extra in that look I couldn't fathom.