Bad writing at the end
**SPOLIERS**
I thought this was pretty good until the end of the movie when the writing went south, IMO.
For the entire movie they establish that the main protagonist, Davey, is a pretty smart kid. He is always careful about spying on the killer, setting up multiple layers of protection with his friends acting as early warning devices. However, when he finally does come up with the evidence and shows it to the police, the writing for him breaks down.
I honestly don't believe that this kid would get caught asleep the way he did. Your serial killer neighbor is still on the loose, and your sleeping like a baby? With the door to your room open? No, I don't think so. Not this kid. If the writing had remained consistent, this kid would behind a locked door and probably sleeping in shifts, with he and his best friend keeping watch. I get that they needed to end the movie, but it seems really out of character.