House is quiet

The house is quiet as a tomb, After a noisy week there is no longer any sounds except those made by myself my wife and our little black schnauzer. It's so quiet its nerve wrecking. I sat up the spy camera in the library. I got 30 some pictures of a green chair in the library. I guess the only strange thing is; I had reloaded the camera with fresh alkaline batteries and they were almost run out. In the kitchen I got 2000 shots before depletion of the batteries. In the library only 30? At the moment everything seems strange and unnatural. Possibly its due to the loss of our elder dog. We still haven't gotten over that shock. I'm presently debating where to try using the camera again.