Hello

Got waken up while sleeping in my car on Yallingup car park (3 hours drive south of Perth) by the police at 3:00 am 10 years ago. I told them I was just having a small nap, but they clearly shouted "YOU ARE CAMPING!!! YOU MUST GO!!!" with two torches blinding me... So I drove still 3/4 sleeping to the next bush where I finished the night...
Following this experience, I now chose quieter spots (preferably behind bushes

). Generally, I'd say sleeping in a car is not big drama.
Have fun!
Fred