A thinner pillow is best for anyone who sleeps on his or her back. This keeps the head from being tilted forward, which can obstruct airflow and cause neck discomfort. Some people find they get the support they need from a tapered pillow and a quality mattress.
Someone who sleeps on his or her side should choose a firm pillow that will support both the ear and the neck. This will prevent the neck from experiencing excess strain. The pillow should fit between the shoulder, neck, and ear with no gaps. Try to find a solid foam core pillow as these have more support.
A person who sleeps on his or her stomach may not need a pillow at all. However, a flat pillow may provide some comfort without obstructing the airway. A pillow under the stomach or hips may help alleviate lower back pain.
With these tips, anyone should be able to find the perfect pillow, no matter how they sleep.