@DEzzNutz1001 said:

That was one depressing ending, but am I looking into it too much?

So all those deaths, but were they even more unnecessary than what it may have seemed like to some viewers? I dont know why they just wouldnt let them leave, but of course if they had, then the ending isnt as memorable...

The alpha dad says it's too risky to let them escape ; and they emphasize more than once in the movie the danger of outsiders knowing ther location.

@DEzzNutz1001 said: ok, so during the last discussion at the table, Edgertons character asks if the young boy sleepwalked, I didnt think about it till right near the end, but it wasnt the young boy who was sleep walking, it was their son_. (There is a huge plot hole here with the dog though, one of the boys would have had to brought it into the house, so why didnt they do a check of both boys hands, clothing, etc, to see if they had touched the dog, who was all torn up and bloody from being attacked by an infected animal?)

Correct me if I'm wrong but we don't know exactly how the virus is passed around to other people (airborne, body fluids, ...) so I assumed it's possible to catch it without touching contaminated bodies. Or did I miss a part where we see that Travis with bloody hands or something ?

@DEzzNutz1001 said: Anyways, I believe it is shown in the final dream sequence as we see their son actually go through the door that he had found open, when he was awake.

Which makes what happened before that even worse...the look they give each other at the table at the end...The what have we done moment, was pretty powerful.

Funny because for me it looked more like a "we're sooooo dead" kinda look.

Do y'all agree or disagree?

Answer C

Yeah, I think OP is right. I'd go further though and say the reason the family were leaving is because they've realised it must have been Travis who was sick. The reason they're telling Andrew to keep his eyes shut is just because they don't want him traumatised by all the gun waving. Which means the look at the end at the table is the horror of the realisation they've shot and killed the entire family when it was their own son, and now they're going to have to kill him (and/ or are dead themselves).

I also don't think the dog bit is a plot hole, just a bit of mystery.

@DEzzNutz1001 said:

it wasnt the young boy who was sleep walking, it was their son.

I agree. And it explains the title of the movie — its the son's sleepwalking that "comes at night."