The answer is nothing, but then again there's very little stopping your neighbour physically from murdering you in your sleep too. Perhaps this is not something

The answer is nothing, but then again there's very little stopping your neighbour physically from murdering you in your sleep too. Perhaps this is not something to worry about, or perhaps it is! The way to figure out whether or not that is the case is to reason a little deeper than "well it's possible", which is true for far too many things to be useful.