Most people replace their mattress reactively when it becomes impossible to ignore. A visible sag. Waking up stiff every morning. A spring that makes itself known somewhere around 3am. By the time these signals are impossible to dismiss, the mattress has typically been underperforming for years. The damage to sleep quality, and through that to everything else, has already accumulated. The answer isn't complicated, but it does require knowing what to look for. According to the Sleep Foundation, most mattresses should last between 7 and 10 years, though the actual lifespan varies ...

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