It doesn’t look right
WeAre/Shutterstock The most obvious sign that you need a new mattress is that it doesn’t really look like a mattress anymore. Rick Maynard, spokesperson for Stearns & Foster, recommends looking for visual cues when changing your sheets. If it’s uneven or sagging in certain areas, that’s a pretty good indication that it is no longer providing the support you need when you sleep and that it’s time for a new mattress. These are the things you should know when shopping for a new mattress.