There are a number of things you can do to extend the life of a sleep set. First, make sure the foundation or box spring is being properly supported by your frame; this will help keep your foundation from bowing or bending, which could affect how your mattress supports your body. Next, keep your mattress clean by using a quality, hypo-allergenic mattress pad. This helps keep your mattress dry, dust-free and helps deter mites and other allergens from embedding in the mattress cover. Vacuum your mattress frequently to remove dust and allergens. And finally, rotate and/or flip your mattress from time to time to help alleviate sagging and the potential occurrence of body impressions.