why was the nighttime scene...

my feeling is that this is maybe the only action we witness where someone is showing what we'd like to think are proper values.

all the other people in the movie act normal & live nice lives while participating in or being complicit in evil. almost all of those moments take place in nice gardens & well kept homes shot in pleasant normal ways.

so the night vision/stark b&w effect we see there is i suppose to show the contrast, that we're now with a person who sees the evil & is doing something against it.

maybe that's my surface level grade 10 essay interpretation, but that's how it seemed to me.

It was a happy accident. Glazer didn't want to use movie lights at all in the movie and so filmed the night scenes with infra-red cameras, which gave that weird surreal effect.

Someone might have already said this but my interpretation is that she is the only character who sees things differently than the rest. Her world is not peaceful, saturated, and beautiful. She sees the situation as fucked up and dark, so her worldview looks different from anyone else in the movie.

It's just adds to the surrealism. Same as the weird audio drones and "growls" that appear at times. It's all meant to set things off kilter.