So no one but me has been in the Niro since Feb, and I thought I would take out the back seat to lower the floor, so after I but in a mattress, I would still have headroom. No as flexible as then I was twenty, or forty for that mater. I found a Millard Tri Fold 4 1/2" mattress at Walmart for $99.99 and with a sheet of plywood and some bolts, I got this. On a hot nite, the ac consumes about 650 watts an hour.