In archaeology, you get special mention in textbooks if you can lay claim to the oldest specimen of something. And today, scientists in South Africa may qualify. They appear to have found the oldest bed. Well, not a bed exactly, more like a Stone Age mattress of grass. NPR's Christopher Joyce has that story.

CHRISTOPHER JOYCE, BYLINE: You and I might not call it a bed. Mats of grass and sedge piled half an inch thick on the floor of a cave-like rock shelter in South Africa. But 77,000 years ago - that's how old this bedding is - apparently, it was a bed of ease. Lyn Wadley of the University of Witswatersrand in South Africa discovered the bedding at a place called Sibudu.

LYN WADLEY: We know that these were used by people very deliberately because amongst them, there's stone tools and little fragments of burnt bone.

JOYCE: Burnt bone?

WADLEY: People were having breakfast in bed.

JOYCE: Stone Age room service, it may sound pretty cushy, but if you've ever lived in a cave, you know how hard it is to keep it clean - insects, for example, a real problem. So what these people did was they laid leaves from a certain tree, the river wild quince, on top of the grass bedding.

WADLEY: And those leaves contain chemicals that repel insects.

JOYCE: Mosquitoes would've been a problem since the shelter is near a river. Birds roosted there, too, and they're full of lice. But even with the leafy insecticide, the place eventually would have gotten pretty infested. Just ask archaeologist and occasional cave dweller John Shea from Stony Brook University. He knows.

JOHN SHEA: Caves are just disgusting places. You know, we shelter up in caves when we do field work in Eritrea and Israel and Africa, and these are places where you get bugs, you get rot.

JOYCE: What hunter-gatherers normally did when their crib got too disgusting was just abandon it and find another, but not at Sibudu. When the researchers dug down into the dirt, they found layers and layers of bedding, burnt bedding. Apparently, when the bedding got nasty, the residents burned it, then made more and stayed on - for thousands of years at a time, in fact. Shea says bedding this old doesn't surprise him. You don't need a Ph.D. to realize that sleeping on rock or dirt sucks the heat out of your body.

SHEA: The interesting thing they've got is they've got evidence for that medicinal plant use so - and the insecticide plant use. What that shows you is that these people are smart.

JOYCE: Smart enough to figure out what plants will give you a better night's sleep. The research appears in the journal Science in their house and garden section. Christopher Joyce, NPR News.

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