Hi, I know this post is old, but i came across it looking for another bird sound and had to reply because I'm pretty sure I know exactly what the noise is. I'm surprised nobody else has posted this. Southern Flying Squirrels. http://www.wildlifeofct.com/southern%20flying%20squirrel.html I live in Orlando and they're everywhere, yet nobody knows they're around because they come out at exactly dusk, party all night, and are in bed before you wake up. But if you happen to have a window right outside a tree they live in, they'll keep you up for hours. I had this problem in my old house. I have them living in my yard now as well, but fortunately their tree is on the other side of the house. Grab a flash light and hang out and look for them. But have patience because they're hard to spot at first. Here's a link to the sound. Here is a link that might be useful: southern flying squirrel

I live in Southwest Missouri and I hear them all the time. I have seen them in the trees, but can't get a close enough look at them to see them enough to identify it. It is a gray colored bird though. We call them "kitty, kitty, kitty" birds.

I know they sell a CD to attract birds in general. I can't think of what it's called at the moment. Does your neighbor have a Purple Martin house up? A lot of people trying to attract Martins will play a CD called the Dawn Song, or Daytime chatter to attract them. I wonder if you could ask if they could turn it down a bit. These songs do not need to be loud to attract the desired birds.

Maybe a Common Grackle? Right now I'm hearing them making a lot of chit..chit.. sounds, alternating with a sort of creaking. Claire