Heading this off with I have not made any actual complaints to anyone but my husband about this situation.

We bought a house on a dead end street. Everything was nice and quiet over the summer. Over the last month, the neighbor who has property backing up to our yard has been making a lot of noise. They have about an acre of land that butts up to our back yard, and it appears that they have decided to turn it into a race track. They have been driving laps, and revving their engines for what feels like 15 minutes at a time straight (honestly, it's probably only 3-5). 

Now, none of this would be that serious of an issue, if it was happening at normal hours. They are doing all this between 8pm and like 3am, even during the week. I'm a light sleeper, so them doing all of this is waking me up, or keeping me awake. 

When we were looking at the house and property, there were no signs of them using the yard as a race track. Am I the asshole for wanting to have the cops talk to them about the noise at odd hours? We keep to ourselves, so we have never met, or even seen who these neighbors are, so I would prefer to not confront them directly. 
