Our mattresses give us comfort from a long day. They don’t last forever, but it can be tricky buying a new one that will give you many years of comfort. Before you toss yours, and even while you are on the search for a new one, you can be more comfortable in the one you have with this trick. If the main reason you are replacing your mattress is because it sags due to body impressions, place a pillow underneath the mattress where the sag is (use 2 pillows if there are 2 indents from to people). Lie down to see if the pillow is in the right spot. Adjust if not. This will add extra life to your mattress while you shop around.