I really think there may have been someone out there a time or 2 and someone developed a bad case of the heebe geebes.
I recently stayed up late watching something scary on TV. I was home alone with DD while my husband was traveling out of the country. It was July, so hot out, and our bedroom windows were open (2nd floor). All evening our two large dogs were extremely restless. Barking at the windows into the darkness of night, pacing, whining, not themselves at all. We live on acreage in rural WA, moderately remote and isolated (there are neighbors, but not within screaming distance, lol.)
Went to bed and the dogs were still restless and pacing. From the bedroom to the front door, back to the bedroom, then to the front window barking again.
I laid in bed and could hear all sorts of knocks and taps and creaks. Then, all of a sudden, I hear this super odd "wrrrrrrroooo! wrrrrrrrroooo!" coming from under my bedroom window, very close to the house coming from just past the treeline on the edge of our yard. "wrrrrrroooo! wrrrrrrroooo!"
It was unlike any wildlife I'd ever heard, though I'm almost always asleep by this hour. I first checked on DD and closed her windows, then ran around the house and locked up all the other open windows. I made sure all lights were off, inside and out (because anyone out in the yard would need a flashlight unless they were equipped with night vision goggles.) I turned on the security alarm and put both the home phone and cell phone in my pockets, pepper spray in hand. I went window by window, with my dogs, and stared into the darkness, looking for movement. The dogs continued growling and behaving strangely.
I was utterly convinced that there was a human presence in my woods, casing the house or preparing to come in and axe murder us in our sleep. That odd noise was a voice signal to their partner, likely out front. I eventually went back to bed and just laid there, hyper sensitive, reacting to every noise. I got zero sleep. I must have run around the house with the phone poised to dial 911 6 or 7 times that night.
But nothing happened apart from the noises.
The next morning, I saw the neighbor and she said, "boy, since you got those chickens, the racoons have been going to town! I think they're partying in your woods!" I stared at her, confused. Turns out the racoons always start up in the wee hours of the morning, long after I've gone to sleep, so I've never heard them or my dogs reacting to them. But my neighbor, who's a night owl, has heard them every night since I got chickens - they were passing through her property to visit our coop (which, incidentally, is located just under my bedroom windows, at the edge of the yard near the woods.)
My point is that my overactive imagination and already hyper sensitive state created a whole story out of something completely innocent. I was mere seconds away from calling the police because I was sure there were people on my property. Now, had the neighbor not intervened when she did, this may have gone on for several nights. Add some sleep deprivation to the recipe and you have a completely rational, generally fearless woman cowering in her house in the dark afraid of something that isn't really there.