After getting a Ring doorbell camera, I moved the Nest camera that had been directed at the front door to the back door and finally signed up for Nest Aware. Once or twice a week, it’ll alert me that it sees a person, when in fact it’s seeing a reflection of me. Here’s an example.
The camera sits on a table in my sunroom. Due to the sliding door leading out to the sun room, the sunroom windows, and the night lighting it looks like I’m on the other side of the dining room sliding door. Very confusing to a camera.