My mom is 96. She's healthy, active and other than normal short-term memory lapses she's amazingly alert and lucid.. But three times in the last year she's mentioned seeing someone walking in the living room...always at night but at different times. If she closes her eyes and looks away, it disappears. She says she isn't frightened by it. I have never been in the room with her when this happens. It happened again tonight (early evening). I'm having her call her doctor tomorrow but wonder if anyone else has had this experience. She isn't taking any opiates, just the standard blood pressure, cholesterol stuff. I did some research online that says it could be dementia- or Parkinson's-related.