The first few nights that I slept at my JC condo, I slept on my Therm-a-rest, so it's only fitting that I've spent my last few nights on it. A Therm-a-rest is a thin camping mattress. I've had this one since 1996. I shouldn't be surprised that it's lasted this long, since it does come with a lifetime warranty. But I have to help it "self-inflate."
My sleeping mat has been around Central America, the US, New Zealand, and of course, New Jersey. I think Roberta took it canoe camping in Belize. I had a different Therm-a-rest for camping in Africa, one I bought in Berlin and gave away in Ethiopia. (I then paid for it by having to sleep on the steel ferry deck in Wadi Halfa, but that's okay because H.M. had a sleeping mat and I never let him forget that he'd un-gallantly not offered it, though I was covered in truck-accident bruises at the time. He defended himself by saying that he thought: "Well, she's been around the whole world. She can probably manage a night without a sleeping mat.")
Some people--who would think nothing of taking a Therm-a-rest camping--have expressed horror that I don't have a bed at the moment. (Not exactly true--I have a very nice bed that is in storage near Liberty State Park.) It's really not so bad sleeping on my Therm-a-rest indoors. It's kind of like camping, except that instead of hearing crickets and frogs, I hear the dryer downstairs as it goes around and around and around.