There's a cluster of light switches at the top of the stairs. Left to right, - landing light, shower, bathroom fan, bathroom light. Every time she gets up in the middle of the night or the gloom to go to the bathroom, she's to manically paw at all four like she's trying to work out the combination needed to get out of an escape room but has never seen light switches before.
We've lived in the house for seven and a half years.