Your teen's pillow also makes a difference in sleep quality. A supportive pillow should keep the head in a neutral position to prevent shoulder and neck pain.
For back sleepers, a medium-firm pillow with medium loft will support the head and neck while keeping the head from tipping to one side. The pillow shouldn’t push the chin toward the chest or cause a stiff or achy body. Place a pillow under the knees to create a slight bend to take pressure off the lower back.
Side sleepers need a firmer pillow with varied lofts, so the neck is supported as well as the head.
Stomach sleepers will need a very thin pillow that doesn't force them to arch their necks as it will enhance back strain. Stomach sleepers will benefit from putting a small pillow under their pelvis to facilitate proper spinal alignment.