Mattresses can sometimes be expensive, which is why many people go without a new one for as long as possible. However, keep in mind that if you sleep a standard eight hours every night, you're spending one-third of your day on your mattress! This can make it the most important piece of furniture you own. This is also why it's good to replace an old mattress when necessary; note a few signs that it's time to get a new mattress and why it's important.
Backaches and leg cramps
When you wake up in the morning, do you normally have backaches or pain in the shoulders? Do you have leg cramps at night, pain in your hips, or general muscle stiffness and soreness? Usually these are signs that you need a new mattress, as your old mattress may not be giving you support and comfort while you sleep. If springs are worn down in certain areas, your body is not being supported and, in turn, muscle groups work harder even when asleep. If the foam of a mattress has compressed over time and isn't strong or thick anymore, your body is also lacking support when you sleep. A new mattress can provide the support you need so your muscles actually relax.
You've gained weight
If you've gained a significant amount of weight, you want to consider a new mattress. That added body weight on old springs can cause them to wear down more quickly so they don't support you as they should. You might also benefit from a firmer mattress so that you don't sink in certain areas. A pillow top mattress may also provide a more comfortable barrier between you and the mattress springs. A new mattress can offer the added support that you need.
Take a moment to look at the surface of your mattress without sheets covering it and note if it seems uneven. This often means that certain areas of the mattress are worn down. If one area is worn down, your body will need to stiffen or tense up when you reach that part of the mattress to support itself. Even if you don't feel very "achy" in the morning, you could be overworking your muscles at night and interfering with deep, restful sleep. One worn area of a mattress may also mean that others area are about to wear down as well. Invest in a new one when you notice this unevenness on the surface.