The misconception is that a firm mattress helps to alleviate back and body aches. What a body actually needs is proper support on all of the pressure points of the body. A memory foam mattress supports the body in every point where it comes in contact with the bed by conforming to the body instead of pushing away from the body. A memory foam mattress envelopes the body and supports the heaviest points of the body, which keeps the spine in line during sleep. The memory foam mattress supports those who sleep on their back, side or stomach.