How often you replace your mattresses does not really depend on a timetable. It depends on whether you still have a comfortable sleeping surface or not.
You should look into replacing yours when any one of these happens:
- You are uncomfortable when you lie down, and wake up tired and achy.
- You see visible signs of wear and tear in your mattress. There is sagging, or you notice lumps. You can hear the bed springs when you lie down.
- You've tried rotating it, but to no avail. It still doesn't feel more comfortable.
- You suffer from allergies, and have had the mattress for a long time. If you have not been using protective, allergy reducing covers, dust mites may pose a problem. Dust mite feces can double the weight of a mattress in ten years, and even the cleanest of beds can have dust mites. There are other ways of addressing the dust mite problem, but it helps to start with a clean, mite-free mattress.
- You are older than forty and have been sleeping on the same sleep surface for around ten years. Your body becomes more sensitive to pressure points with age. Pressure points can lead to tossing and turning and disturbed sleep which can be bad for your over all health.