The changes in the cervical spine curvature stiffens the muscles surrounding the shoulders and the back of the head, resulting in upper back pain. This can also be caused by a prolonged bent-over posture. To alleviate this condition, release muscle tension and restore the cervical spine's natural curve. Stretch and strengthen your neck on a regular basis. Hanging your head on the side of the bed before going to bed is another effective approach to relieve neck fatigue.