All SISSEL ® Orthopedic Pillows feature substantial support to the lower cervical spinal column. As a result, the entire shoulder and neck region is well-supported. Due to its unique angle, the pillow glides between shoulder and cervical spinal column and fills the space between, which gently leads the spinal column into the anatomically correct position. A slightly stretching effect on neck and spinal column might make the change feel unusual at first. Your body will require a little time (2 to 14 nights) to once again get used to a healthy natural sleep