I believe it was in Yosemite me and my grandparents were staying at this kinda like a motel style building, my grandfather had a separate room so I was in the same room as my grandmother(this was when I was 8 or so), who snores horribly, but I woke up in the middle of the night and right as I did the lamp next to my bed turned on I heard the knob thing click from being turned, I got scared and hid under the covers, then about a minute later I heard a second click and it turned off. The weirdest part was my grandmother was asleep, I heard her snoring, and my grandfather didn’t have a key to the room, I also didn’t see a shadow through the covers.