I went into the kitchen last night (around midnight) for a glass of water. When I switched the light on, I saw something jump off the clothes horse (I dry my clothes in there) and run behind the washing machine.
It all happened very quickly, and my eyes were still adjusting to the light, but I think it was a mouse, it seemed the right size. When it jumped off the clothes horse I thought it was a bat or something, but then it ran across the floor.
Anyway, not really sure what my next move is on this one.