It comes at night

I've watched so many good horror movies like the ring and the conjuring that i've become numb to anything other than elite horror movies.

it comes at night definitely does not qualify as an elite horror movie. but i got serious creeps from it, even a day later. same effects as i had from the ring (closet scene).

first, the jump scares and costume/makeup were extremely well done. but that's not enough. the build up and suspense throughout the whole show was excellent.

but the plot was lacking. or was it?

I have come to realize the true meaning of the movie, and realizing it really brought the horror to my spine.

Spoilers ahead:

Travis was infected from the start. His "nightmares" throughout the movie were a combination of 3 possibilities, and we never know for sure which are which, although we can speculate.

1) just plain nightmares. the one where kim puked into his mouth would be this.
2) memories of the past: discovering his grandpa was infected. This also gives credit to the idea that Travis was infected from the start. He could easily have caught it from discovering his grandpa, or from Stanley who was his grandpa's dog, and who acted strangely throughout the movie (lethargy, barking at weird stuff)
3) sleepwalking: Final nightmare where he goes out and finds Stanley being ravaged. He is most likely the one who opened the red door and passes the infection to the little boy, if the little boy is infected at all. Will telling Kim to cover the little boy's eyes could easily be not wanting him to see his own dad in an act of violence. However, Will saying at the end: We just want what's fair (food and water), enough for the both of us) is quite telling. The little boy could just be normal sick, and everyone thinks its the infection.

the fact that it takes 1 day to show the symptoms could be for the final stage (showing skin lesions etc). Travis could have been infected all along, and only went into the final stage at the end.
another possibility could be that "it" comes at night was referring to the sickness, and Travis wasn't in the final stage or showing symptoms because he couldnt sleep. Only at the end where we see his mom telling him to relax does he really sleep for the first time which brought on the symptoms.