When I stare at the ground over the course of a few seconds everything starts to get brighter. I’ve tried to look this up before but had no luck or found something that just didn’t work.
I have recorded an example of this to view it click here:
Hi!
It’s autoexposure!
You can turn if off in postprocess! Just set both min and max to the same number (1) and it’s gone! 
Where will I find post processing? The only post-processing I can find in the project settings only has two settings that have nothing to do with what you said. How do I edit the value you were talking about?
Sorry!
In your World Outliner panel, among your other items there is a PostProcessVolume.
There search for Lens and Exposure and you will see the settings! 
