A fly screen is a good idea, but they come in the windows as well
Lemongrove; Not sure what your fly screen looks like, but from the "land of flies", big and small, fly screens are essential for hygiene and a comfortable night's sleep. They are custom-made to fit every door and window and made of a fine mesh aluminium "fibre" or similar in polyester.
They can be fitted with keyed locks so that main doors and windows can be left fully open to catch any cooling breezes, whilst maintaining some security. We appear to have several GNs with Aussie connections and who might care to confirm this.
I remember our (new) house when we arrived was not fitted and were nearly bitten to death by mozzies which were attracted to my darling Vera like a magnet. So she had them fitted quick smart.
Fortunately they leave me alone, probably because I'm a natural repellent. Good Luck!