Your sleep position plays a key role in choosing the right pillow . Side sleepers generally need a firm, thick pillow to support the neck, while back sleepers benefit from medium loft pillows that cradle the natural curve of the neck. Stomach sleepers require soft, thinner pillows to avoid neck strain. The goal is to keep your spine aligned regardless of how you sleep. Choosing the wrong pillow can lead to stiffness, headaches, or restless sleep. Materials also matter—memory foam contours better, while latex provides more bounce. Identifying your sleeping posture is step one to getting better rest.