An unmade bed has indentations in the sheets or mattress and multiple pillows - Komsan Loonprom/Shutterstock A sagging mattress can cause you to feel pretty sad when you get out of the sack. The lack ...

You're probably familiar with a box spring, the simple wood frame with springs that acts as a support base under older mattresses. It's not a highly technical piece of equipment like a smart bed (or a ...