Pillow Adjustment Period:
When switching to a new pillow, it usually takes 3 to 7 days to adjust. This is because your body, especially the neck and shoulders, has become accustomed to the support and shape of your previous pillow.
During this adjustment period, you may experience some temporary discomfort, such as stiffness or mild pain in the neck upon waking. This is normal and typically subsides within a few days.
Changes in pillow material, height, or firmness may alter your sleeping posture and spinal alignment, so a short adaptation period is required for your body to get used to the new pillow.