Sleeping without a pillow is not automatically beneficial for cervical straightening. For some people, no pillow lets the head tilt backward into extension, increasing discomfort. A very high pillow can also push the neck into flexion and feel worse. The real target is not “pillow vs no pillow,” but neutral cervical alignment with the right loft and support geometry. For back sleepers, a low-to-moderate pillow that gently supports the neck gap often works better. In cervical straightening, individualized exercise and posture correction are usually more impactful than the pillow alone.