There are people who do. With the passenger seat pushed forward and rear seat folded there's a 6'5" length there. But you have to fold yourself in and out of it. And getting up for bathroom runs would be tough. I'd rather just keep the back for storage and set up the tent outside. If it's cold enough in the winter can pay the $4 a day for electric to run a space heater in the tent. Even in the summer nights are cool enough in New Mexico to sleep well.I wouldn't want to try to sleep in a Prius