My neighbour used to have to sleep pretty early in the evening...as he worked off hours most of the time. There was a dog nearby that barked and barked and barked...keeping him awake all the time. He went over and asked the owners to try to keep a lid on it, but they never did anything.
One day, he went over at 3am and rang their doorbell at regular 5 second intervals. When the guy came downstairs and wondered what the heck was going on my neighbour held up his finger and said "Oh this...this is my dog and it's barking...is it keeping you up?"