I totally agree with whoever mentioned that there must not be many sleepwalkers due to them all being perennial nominees for Darwin awards...
Like for instance, the "deadly" cats that gathered outside the house the whole time. Obviously the mother sleepwalker has no issue using guns (and had great aim to take out those cars in one shot), and those cats weren't really moving a whole lot... So their solution to the problem is to hope that these cats wander into getting snagged by the couple randomly placed bear traps in the yard to deal with this existential threat? What the fuck?
Couldn't they just sit inside the house with a reasonably strong air rifle (so as not to bother the neighbors), open some windows, and then shoot the cats as they sat around in the grass like dumbass targets? Then after a night of plinking away at cats, they could have safely gone upstairs and boned in happiness like two nasty, shiny naked mole rats...
Also why string up the cats and hang corpses from the house? I've never heard that cats are afraid of dead cats, and I wouldn't be surprised if the furry lizards tend to cannibalize their own. So their dead kitty display might have actually been bringing more cats to the yard? Wouldn't a shovel and a shallow grave work better?