One of the first theories that will come to owners’ minds is that the dog is barking because it hears strange sounds emanating from outdoors.
You may not have thought about whether the room your dog sleeps in is bothering it. Believe it or not, even dogs suffer from environmental stress.
Some breeds need constant stimulation and exercise. If your dog isn’t getting enough of these in the course of a day, it may act out even at night while you are trying to sleep.
If your dog is a social breed that loves to be around you but is suddenly expected to spend all night on its own, it could trigger nervous barking and even destructive behavior.
If when your dog first started barking, you fawned attention upon it every time, you may have reinforced the idea that when it barks, you’ll respond.