We also have a light that turns on by itself. It never used to do that before the summer when we lost our son. I believe Hamel’s reports.
When we moved into our home in late 1980’s there was always the sound of the bathroom light switch turning on. The light did not turn on but it would click at night. I had a pic of my step Dad who had passed away on the wall near the bathroom door. It clicked every day until I took down the photo during some renovation. Everyone who came to my home heard the clicking of the switch. I had my Mom move in with us after he passed. Maybe he was making sure she was well cared for.