Many years ago the wife and I lived in a sketchy neighborhood that was near my law school. One night, I heard rustling and thumping on the stairs to the attic. This was an old house with no way to secure the unfinished attic/second floor. Sound asleep to adrenaline flush in no time flat. Grabbed the sidearm and flashlight, more thumping and rustling.
Got in position, flung the door open and damn near shot the fattest raccoon not living off garbage in a state park. It was hours before the adrenaline dump allowed to me to go back to sleep.