There has been an airport on the Mascot site since the year dot, so every person who purchased property in the area knew full well that there would be aircraft noise - and probably got a discount on the purchase price as a result.
It's farcical to have Australasia's main hub shut up shop at 11pm.
Operators might want to consider AKL as an alternative to SYD. AKL would be open 30 hours a day if that were possible.