It comes at night (2017)

This flick's one of those indies that actually got a theatrical release, and I'm not sure how you guys feel about that.

The movie's basically The Village, post-apocalypse edition. It's unclear what kind of virus they're dealing with, but I think Mortuary (2005) began a "black vomit" trend, which is present here.
The "It" probably refers to the paranoia they have for each other, although it's happening 24/7, not just nightly.
Joel Edgerton plays a hard-nosed family man, but a fair one, who has to make some tough calls throughout.
So there's lots of action, with shades of grey everywhere.

All in all, I recommend the film. My only complaint is that (much like The Village), it's a film pretty much marketed as horror, but is really a thriller. 7/10