You secure the area as much as you can, and go to sleep.

You glance around the dismal interior. It's rotten, dark, and damp, but it's better than the bare ground. Locking the door behind you, and barring it with the rotten remains of a sofa, you bar every window you can before setting up impromptu bedding from your sleeping bag and a thermal blanket in the corner.

With how traumatic your day has been, you're completely wired. After snuggling into the bag and warming up, it takes you hours to finally get to sleep.