Keep your bed in shape :- If you’re waking up stiff and sore, check your mattress. How long has it been since you replaced it? “It’s the same as with running shoes: you put a lot of pressure on the mattress and deforming the foam over time,” Polivka explains. Twice a year, flip the mattress over and check for divots, dents, wear and tear and breakage. If there are spots where the mattress isn’t springing back the way it used to, it’s time to spring for a new one. Consumer Reports recommends that you consider changing your mattress if yours is at more than 5 to 7 years old.