Why are my dogs uncontrollable since being neutered?

My dogs (2 males, 1.5 years old) got neutered just over 2 weeks ago, and I expected them to be more calm, however, they are going crazy. they are barking constantly. they wake us up in the middle of the night barking as if there were an intruder in the house, which is very unlike them. Prior to being neutered, they would only bark if they needed to go potty, but now it’s constant. They also wrestle more aggressively than before. Before they were very easy going and now they are getting hard to manage. Is this normal and will it stop ? We are losing sleep over their excessive barking