Who controls airspace and time in my area on helicopters? I live in Newport Beach which is located in Orange County, California. I recently moved to an area where helicopters fly once in a while at 2-3 am above my house. Since I live on a hill, the sound is pretty loud and it wakes me up at night. 

I was wondering where can I find more information about who controls the airspace in my area in regards to helicopters and how I look up the rules. I've googled a few things but can't find any answers. I'm not sure if it is the FAA or the county or the city or the state. Any pointers in the right direction would be appreciated.
Like others said, if it's military you're probably out of luck. If it's police, they don't fall under federal jurisdiction, so it'd be up to whatever department is operating the helicopter, city, county, etc. At 2am it's unlikely to be civil aircraft, but if it is and they are operating out of John Wayne Airport, their noise abatement rules are published here.