I think that living in a constant fear or being attacked is something many people don't think about. As someone who regularly spends time alone in the woods at night I know how your minds start playing tricks on you and it can get quite intense and scary even though you know it's just animals out there. Just imagine trying to sleep in a abandoned house and then hearing a zombie walk outside. Even if you made sure that location is as safe as it can be that's still going to be terrifying as hell.