Does anyone know where to buy a bed that lies flat on a piece of wood?

I saw a picture of this bed on the Better Homes + Gardens website and the source was "Living Room" magazine. I cannot find anything other than platform beds online- and this bed was a piece of wood flat on the floor and a thick mattress. Any ideas?

Answers:
IKEA

Other answers:
Search under "Futon."
Search under "Futon."
Try IKEA.. that's the first thing I remembered seeing.

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