A knee/leg pillow helps maintain leg and pelvic alignment during side sleeping, improving load distribution across the lower back and hips. Supporting the knees can reduce the top leg’s forward drop and decrease lumbar twisting. Many people experience less morning low-back pain, reduced hip tightness, and less knee-to-knee pressure. Because the body functions as a kinetic chain, better pelvic stability can indirectly reduce compensatory tension in the neck and shoulders. In practice, a thin, comfortable support that retains shape is often enough. If pain persists, the underlying cause should be evaluated rather than relying solely on accessories.