If you are a side sleeper, you probably prefer a medium to soft mattress. The reason why is, unlike back and stomach sleepers who rest a large surface area on their mattress, you rest a much smaller surface area. This focuses more weight on that area, causing you to cut deeper into the mattress towards the dense core, and putting more pressure on your hips and shoulders. On a firm mattress, this leads to tossing and turning, improper spinal alignment, and poor support that can cause a sore back and neck. So if you are a side sleeper, be sure to shop mattresses that clock in at mid- to high-ranges on our Comfort Scale for your best and healthiest sleep.