I've never slept in anything that short. Are you looking for ideas to facilitate sleeping in such a small area? Only way I know to do it would be to build a platform that would fit over a forward folded front passenger seat. The platform would need to slide or fold back to allow the passenger seat back to be put back in the upright position. you could store stuff under the platform as well.
Not really applicapable but for what it's worth, I sleep in my Tahoe pretty frequently, doing it this weekend actually. The 2nd row seats are split and fold flat with the rear cargo floor. I fold the driver side 2nd row seat down and move all my gear to the passenger side of the cargo area and stretch out and sleep like a baby. I'm 6'4" and can stretch out nicely. I love sleeping in the truck unless it's 100* outside. It's quiet, safe, and comfy.