In my sleepy state I couldn't work out what it could be. There wasn't a tap nearby, or anything with water in. It seemed to be right by my head.
I turned and saw the source.
Izzy was helping herself to my glass of water.
I don't really understand why she needed to do that. I'd refilled the cat's bowl in the bathroom(and their kitchen bowl) from the same tap at the same time as the water was drawn for my glass. Same tap. Same water.
But I don't mind. Much.