Dogs and their ancestor's wolves are pack animals, maybe the sleep barking wakes the other pack mates making them more aware of their surroundings and better ab

Dogs and their ancestor's wolves are pack animals, maybe the sleep barking wakes the other pack mates making them more aware of their surroundings and better able to defend the pack from threats during the night? Maybe even The barking itself helps to ward off threats that would otherwise attack a sleeping animal. Is there even anything that preys enough on wolves where enough of them are being killed by it that the sleep barking would be selected against?