How do I get rid of reflecting light and make this room darker?

So essentially what I'm trying to figure out is how do I get rid of light bouncing off of objects? For example, notice how the ceiling is making the whole room lighter than it needs to be. I have the sky set to the darkest options, I have all sunlight settings set to 0, and although I do not have fog, adding fog doesn't change the fact that the room still reflects light. What can I do? How can I make this an actual dark space?

So essentially what I'm trying to figure out is how do I get rid of light bouncing off of objects? For example, notice how the ceiling is making the whole room lighter than it needs to be. I have the sky set to the darkest options, I have all sunlight settings set to 0, and although I do not have fog, adding fog doesn't change the fact that the room still reflects light. What can I do? How can I make this an actual dark space?