Ian Hubert = Genius

Arielle Hope, Sarah Schoofs, Ashley Mundy. Uh. Twice.

Day for night is flipping hard. It's just obnoxious because lights don't work the same way. The sun, it turns out, is really really bright.
On the other hand, without really huge lights at night it's impossible to really get exposure.
So you need to do about ten million tricks just to get things to look like they're night. You have to make flashes of firearms light up around them, which is a fancy bit of compositing. Lens flare, sky replacement, they all come into play.
I'm really glad I didn't have to do it! ;-)
Ian Hubert. The man is a genius. Check out Karma Pirates.