Waking up sneezy, itchy, or more tired than you should be? Your mattress might have more to do with it than you'd think. Here's how to tell — and what to actually do about it.

Your mattress is sagging, your back aches every morning, and replacing it feels like a big spend. Sound familiar? Before you invest in a brand-new mattress, find out if a mattress topper could be the affordable fix that transforms your sleep — and when it simply won't cut it.