Sleeping on your side will put a lot of pressure on your hips, shoulders, and neck, which can cause tension throughout the spine. A mattress that is too soft is not good because if it sinks in too much then your spine will also be curved. If a mattress is too firm, it will cut off a lot of the blood circulation in the body, and it will potentially cause major aches and pains because it doesn't contour to the widest points in the hips and shoulders. Therefore, side sleepers need mattresses that are soft enough to relieve those pressure points and contours well to the body as well as support the natural alignment of the spine.
Here are four types of mattresses that are ideal for side sleepers: