The staff seem to have a way to avoid falling asleep if the murders are happening at night. They have advantages we do not. This many locked doors, I have no doubt they have some... some passcode? It's a horrible assumption that they're able to bring a victim somewhere and slaughter them, but -

[ The terminal. ]

Maybe we could ask Judy? Doubt it'll prove much but if we know there's something hidden in the terminals, we could be able to narrow down the field a bit.

...Best case scenario, you know.