I've got a 3" thick thermarest on a cot. Lots of storage space underneath, and super comfortable.
If you're not used to your proposed sleeping solution, I recommend you camp in your kitchen for a couple of nights (any hard floor will do).
once you've got that part figured out, Plug your computer into your stereo, turn the volume to maximum and have it play sound effects randomly for the next week.
If you use a cot in your tent, you may want to tape some sponges to the cot feet so as not to poke holes in your ground cloth. also, a deep rug inside the tent, no shoes in the tent, and I hang my shoes up (force of habit from living in areas with BIG GODDAMN SPIDERS).
"TO DO IS TO BE" - Nietzsche
"TO BE IS TO DO" - Kant
"DO BE DO BE DO" - Sinatra