This is mentioned upthread, but to make the point again, if this man - their teacher - just blundered thoughtlessly into a room of sleeping girls to wake them up, with no mind whatsoever about the fact that they might be undressed, half-dressed, whatever, then he is not an 'innocent, ' as his fan club on this thread would claim, he is a safeguarding risk.
If he deliberately walked into a room of sleeping girls, knowing full well that they might be undressed, half-dressed, whatever, in order to flex his authority and get a perverse pleasure from 'catching them by surprise,' then he's a safeguarding risk. And then some.
Girls need to feel safe in that environment. His actions undermined that, and I suspect it was deliberate.
And to those posters bleating about 'hurting his feelings,' and so on, it's profoundly depressing to think there's yet another generation of girls being brought up to consider the man's feelings first, to suppress their discomfort, to accept the dominance of the male gaze in all its forms.
Get a grip and a life op.jezus... You are one of "those " mums for sure
Does any of this, the serious safeguarding issues that posters have shone a light on mean anything to you?
The OP has got a grip on this issue, thank goodness, for her DD's sake. Girls need parents who support them and embolden them to navigate issues like this. I feel desperately sorry for girls who are taught to just suck it up, 'cos that's just life, innit?