I gotta hand it to you guys sleeping out in the open, or under a tarp! I'd tried it a few times and ended up getting eaten alive, or at least kept up all night by bugs.

A few years back I was sitting at the base of a tree over looking a small gorge in the woods while deer hunting. The whole gorge was lined with 2-3 foot tall weeds. After sitting there a while I hear several really strange sounding noises working their way toward me in the weeds that sound kinda like a turkey, dog, racoon, alien mix. It would come in, then go to the side, then come in, and change course every couple seconds. While trying to figure out what the heck it was coming at me, a red fox burst out of the weeds and ran right over my lap! We were both so shocked at the sight of each other I hardly moved, and he just kept on truck'n before I could do anything about it! But he stepped right on me! It didn't take me long to realize that he'd smelt, and was drawn in by the beef jerky I had in a zip-lock bag my pocket, and had snacked on a while earlier.
That experience along with the fact that most other times we go camping either a racoon, opossum, or some other kind of animal (some are still a mystery) will trot around or even through camp makes sleeping out in the open kinda unappealing for us. We never keep the food stuffs in the tent. But especially with having a kid and a dog with us, little crumbs are no doubt dropped on the ground around the area. One time we split open a watermellon on a campground picnic table, and within a few hours had a swarm of racoons up there eating it!
We once tried just using a screen room without a floor in Michigan, and freaking June Bugs, and Lightning Bugs came up out of the ground durring the night and were flying around all over!
We practice about the same kinda thing as TAB. It depends on the trip which tent goes with, but either a giant one my wife picked out, that
IS nice because you can stand up in it and walk around / change cloths. Or we have a little "Jeep" 7'X7' 4-person tent that's 11lbs for hiking trips.
I also take a military rip-stop parka with me EVERY hunting trip that I sit on to keep a dry butt, or can use as a small shelter in case of unexpected rain, or I ever end up spending the night in the woods unexpectedly (lost).
Animals DO keep things interesting out there!
