With our gardener, it is the leaf blower at ungodly hours. I like to think there is a special circle of hell for gardeners that mess with my sleep! Lately though, it is the people upstairs, or more specifically, their dog. He has woken my husband and me at 5:30 three mornings in a row. He barks All. Day. Long. I have left three very nice letters for the people telling them it is a problem, and to let me know if I can help with the dog as I know they work all day. I got no reply to the first two, and the third was answered with a rather snarky missive that basically said deal with it. I think not. I now have to take the problem to the property manager. I didn't want to do that to them, but they have given me no other choice!

(I am SO enamored with that little man!)
Yep.. the leaf blower kills me too!
I was actually on the other end of a dog barking issue, where I feel I'm only partly to blame. Definitely discuss it with the property manager! A barking dog is not cool. Heck when mine barks it drives me batty too! I got a complaint and that following weekend I ordered a bark collar for my baby (the sweet one on the right in my profile pic). I then had a discussion with my neighbor that was causing all the ruckus 2 feet from my fence, and highly recommended that they move their squealing kids away from my fence. I then called my property manager back and told them that my barking dog is now wearing a bark collar, but that if my neighbors stand beside my fence with their squealing kids antagonizing my dogs, then I'm going to take it off. I also told him that I had spoken to my neighbors and that if he had any specific issues to call me directly and that we could discuss any further modifications to the changes I have made to limit the noise coming out of my dogs.
I don't think he realized that the person complaining was taunting the dogs with their kids playing on the sidewalk beside my fence, nor did he realize that they were parking their cars illegally beside my fence (basically using it as their own personal playground/parking lot). So that pretty much fixed the issue!
Anyway, for your issue, the property manager holds more clout! So it sounds like you will have to get them involved. They will have to either get a bark collar or hire someone to go in and walk the dogs or help mitigate the noise somehow.