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Staying overnight at Petra

Staying overnight at Petra is forbidden but possible. Obviously, you can camp in a remote area, like the top of Umm-Biyara. It's almost for sure no body will find you.
But if you are not that adventurous, here's what you can do:
Wander around the ruin after dark (6:00pm in winter). You will soon run into a local Bedouin. Some of them will offer you a tea. Be prepared to pay 1D for the tea. Then some will offer you to stay overnight at their cave/souvenir shop. I'm not sure about the price, it's probably around US$15.