It is important to know when it's time to get a new mattress. If an old mattress sinks apparently in the middle or is no more comfortable as it was prior, then it is possibly time to purchase a new one. Putting boards under a sinking mattress is a general trick to prevent it from sinking in the middle is only a short-term fix for the sinking; a new mattress is still required. Sleeping on the unsuitable mattress can produce lower back pain which may go worse if it already exists. Lack...