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Have you noticed your mattress getting progressively uncomfortable as the years have gone on? If so, it might be time to toss the old, unsupportive bed out and opt for a new one. Most mattresses should really be replaced every six to eight years, according to Sleep Foundation. If it's been longer than that, or your mattress is sagging, making a lot of noise, or you're waking up with muscle and joint stiffness, you're definitely due for an upgrade. Read more...More about Mattress, Mashable Shopping, Culture, and Work Life