Most people keep a mattress long past the time when it should be replaced. This may be due to finances but is often because signs that a new mattress is needed are attributed to other factors. Tossing and turning all night, for example, may be chalked up to stress at work. That back pain is blamed on the touch football game played yesterday at the family reunion.
Recognizing the signs of a worn out or failing mattress will save people money, time, stress, and suffering. Waking up feeling tired is one sign that is ignored or attributed to staying up too late. If that happens once or twice in a month, the issue is likely the time of retiring to bed. A frequency of once or twice a week is probably a function of the mattress.
The Crux of the Problem
Signs go unnoticed because most are gradual and not connected quickly. A short temper, more frequent headaches, and general muscle soreness are common among people who are becoming sick or may have a serious medical condition. These symptoms are also common among people with sagging mattresses. It is easy to see how the issues can become clouded.
More Concrete Criteria
Rather than read my comment and try to figure out how to connect the dots, there are also concrete criteria to help people determine if a mattress requires replacement. One is age. Mattresses typically last ten to fifteen years with average use. A mattress that is older than that should be replaced. Replacement is required a few years earlier if users are obese, incontinent, have skin conditions, or suffer from respiratory issues.
Appearance is another clear sign. When changing the sheets take the time to complete a visual inspection of the mattress. Indentations, sloping in one direction, or uneven spots mean it is time for a new mattress. Flipping the mattress may extend the use but not for very long. A proper amount of rest is imperative for overall favorable health, dealing with daily stresses, and level of concentration. When in doubt about whether to replace the mattress, it is better to replace it than continue suffering from the effects of a failing one.