Nice to see this thread active again with new comments and suggestions. Every air mattress I have had leaks air after a couple uses. No matter how pricey. And, they always make noise and shift air when one rolls over. And the plastic is often not comfortable when it's warm. So, I got a regular 100% cotton fill twin size futon, in black. Overstock.com for just under $100. a piece of 4 inch cut to size foam underneath the futon along the seat back "drop off" to fix the lump, and it's super comfortable. Use black sheets as well, and it really blends in with the interior. Like others, some plastic bins behind front seats raise that area for pillows. And window sunblocks all around for complete privacy and shielding from street lights, etc.