Creepy Experience

I just had a creepy experience, and it's my first time encountering something like this. I don't know if it's because it's 2 am and I'm still not sleeping, or maybe it's too much screen time. But I looked in the mirror, and for a second, it felt like I was looking at someone looking in the mirror, not me looking at the mirror. It feels like when you're watching a movie and the character looks at the mirror.