i believe they recommend every 10 years, if not sooner, especially if you move around a lot. (from house to house or whatever, i mean)
i havent tried the tempurpedic but it looks really nice. i have tested the sleep number, in one of their stores though. guess its ok
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Your memory is a monster; you forget - it doesn't. It simply files things away. It keeps things for you, or hides things from you - and summons them to your recall with a will of its own. You think you have a memory; but it has you.
-John Irving
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