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1 night, in a backyard. Inflatable mattress.
Go to Target, Wal-Mart, K-Mart, or whatever and buy an inflatable mattress. One of those 6-inch thick buggers.
There's no sense spending hundreds of dollars (or a hundred) on some kind of fancy sleep system that you'll use 1-night and still probably end up with a sore back anyway.
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I have used foam pads, no pads, therm-a-rests and all sorts of things sleeping out doors. But not hammocks, they don't work for me as a side sleeper.
If weight and space is not a major issue, then an Intex inflatable mattress from Walmart or Amazon is a really good item. I started off with them by borrowing one from a friend to do some camping. It had an electric plug in air filler, but a trip to Big7 got me an inexpensive hand air piston pump that worked great.
It worked so well for a week of car camping, that I got my own when I got back home. They are inexpensive, reasonably rugged, and let you sleep out in the woods almost as if you are home in your own bed. If I am packing it in, sure, I'll use the thermarest. But if my car is right there, or only a few hundred yards away, I'll take the Intex. Take reasonable precautions with a ground tarp and check the area for sharp objects, but those mattresses will work fine. They keep you about 8" or so off the ground, so you won't get wet if it rains and your floor gets wet. I'd also rather use several twin sized ones rather than one full or queen size. Easier to move them around that way.
If it is cool, I'll use some thin pad or a folded over fleece blanket on top of the mattress since you loose more heat from below than above.
They also work fine when you have company at home, and can inflate a mattress and set it on the floor for your guests if you fill the house up.