I've slept overnight in Melbourne Airport, in Australia. I know you can't do this in Sydney Airport (they close). However I can't find this info for Canberra.
I've found a cheap flight that goes via Canberra overnight, and I'm quite happy sleeping on the floor if it's possible. But sleepinginairports.net doesn't have any reviews or info, and I can't find opening hours on the airport website or elsewhere. It's only recently started having international flights again, so information seems to be scarce.
Question: Can you stay in the airport overnight?