Sorry for not replying guys, haven’t been checking thread 
@KRushin, without LPV you can still have shadows, but it will be much lower quality of lighting overall. reason everything goes into unlit at night means you probably have an ambient cubemap set up in your post process, and because of Eye Adaptation, it makes light really bright at night.
@tehwave and @Alexarg: Like Shoiko said, colors of sky are controlled by various gradients. Also, you can try disabling fog. Eye Adaptation will also make everything really bright at night, so try turning that off and see what happens.