I have now confirmed with absolute certainty that objects in my house are being moved around and it's not me doing it.
So a little while back I started noticing that objects weren't where I expected them in the morning. Nothing important. Nothing missing. Just stuff moved around a little bit. Like my usual chair at my kitchen table wasn't right where it should be. Stupid harmless things like that. The obvious explanation was that I must have moved it the last time I got up, and just didn't think about it. So I tried to pay attention to it. Still moved.
So I said hug it. I made a point to know where everything was before bed. I took notes. If they moved, it could not be me. They're right here, right now, and I'm not touching them again tonight. List made. I'm going to bed.
Still moved.
Either I have a poltergeist, or I am doing some unusually elaborate sleepwalking despite having no history or risk factors for sleepwalking at all, and have managed not to hurt myself yet. Or someone is quietly breaking into my house, harmlessly rearranging stuff, not touching the cash I left plainly visible, and politely locking the door on their way out. I kinda doubt that.
So I suppose the next step is to set up cameras and figure out where I'm going to store 8 or 9 hours of video.