I rocked a memory foam mattress for 2 months squished in the back, at one point i even took out the passenger seat and 4 of us camped in the car.
On the odd Friday id park in front of work with a note on the car saying “wake me up” just to save 30 minutes in the morning. I sleep like a baby in the car and you sure can lock your feet and hands in and give er in a hatch. Memory foam ftw.