We were sitting in probably the coolest room in the house, my wife and I, when she uttered a small exclamation ... and then - "That was a four-star floater in my eye !" ... then ... after a small pause ... "There's a bird in the house." At which point I woke up and took some interest. The bird, of course, as you probably already can see was a bat - I think, a pipistrelle. It took us about five minutes to locate him/her, clinging to the hot water pipe in the shower room, tightly wedged with his head on one side of the pipe and bottom on the other.