My dog is too loud at night?

Two weeks ago, we bought a rottweiler dog. He's a bit aggressive at times, but he hasn't attacked anyone. For the past week or so, he's been barking at night as if there was an intruder. It got me and my husband up and we had to look for the intruder the first time. The next night, we found out that he... show more Two weeks ago, we bought a rottweiler dog. He's a bit aggressive at times, but he hasn't attacked anyone. For the past week or so, he's been barking at night as if there was an intruder. It got me and my husband up and we had to look for the intruder the first time. The next night, we found out that he apparently does this whenever he sees a car go down the street. It's been waking our neighbors up, who keep bítching about it. What does it mean that my dog flips out whenever he sees a car at night? He doesn't do this during the day.
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