Those are the sounds you like to hear. I don't react to night time sounds at all because they're peaceful. Besides...I have 6 Corgis. If a flea farts a half mile away, I know about it. If you have dogs you know there's a difference in the way they bark at "stuff" in general, and when they're really barking at "something". The question then is what is the "something". Also a difference in how many are barking. If it's just one, 99% chance it's nothing to worry about. If all 6 are going ape-s**t it's time to investigate. I also have cameras all around the house. Very helpful...