Are Opossums related to rats? Why do they enter a comatose like state?
But unless you have a body like a kangaroo, the amount of energy needed to hop regularly when your mass is above a certain amount will be more than you can afford. Try hopping to work tomorrow instead of walking and see how long you can manage it.
Playing dead doesn't seem like much of a strategy, but it works for the opossum, commonly known as the possum.