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Plank Mattress: "The firmest, flattest, healthiest way to sleep" — at least in the western hemisphere.Brooklyn Bedding
Ever since I returned west after living in Asia, I've sought after a bed as firm as the one in my apartment there, which is to say something between a washboard and a poured concrete floor. It was the best mattress I've ever slept on.
Why, you wonder? No, I'm not a sadist, exactly.