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Often, a medium firm mattress is more comfortable as it allows your shoulders and hips to sink in slightly. If you have lower back pain, you may want to consider a firmer mattress with a padded cover for support.

Check your existing mattress to make sure it does not sag at all or cause you any discomfort. If so, it may be time to invest in a new mattress. Though you can use boards underneath the mattress to help with the sagging, this is a temporary fix and you will eventually need to buy a new mattress to get a good night's sleep.

When you are sleeping on your back, it is essential that your mattress provides good full-body support, including lower back support. In a mattress, support is provided through the coils or inner springs. Different mattresses will have different arrangements and numbers of coils. As well, the padding of the mattress can come in different thicknesses, from seven to 18 inches deep. You should always try a mattress before buying it to ensure it is comfortable and supportive for your body.