Never, so far.
Honestly don't understand the "everything will kill you" meme. In the US there are animals that can literally hunt and kill you, whereas all we have is snakes that might bite you if you happen to walk on it. That's about it. No snake is getting a whiff of you camping and coming to try and eat you.
https://en.wikipedia.org/wiki/Animal_attacks_in_Australia
I'm more at risk of being in a car crash and dying on the way to work than I am at getting nope-roped in my sleep.