Hey Meela, welcome to the forum. Our girl, shes 8 months, is also protective/cautious at night. If someone is coming in the dark, she stands at attention, puts herself between whoever is coming and her hair goes up. She used to bark often but now she is more quiet. She reacts stronger at noises during the night also. American Bulldogs have a tendency to be protective/aggressive at night. At least this is what I've read from multiple sources. This may be the norm with other bully breeds like pits but I'm not sure.