It might be because you haven't realized that… Every joint in your body has a "neutral" position. This neutral position is the position for your joint(s) that is most comfortable. Why? Because the joint when it's in this happy place has no tension or strain!
So what position is this for your head when you're sleeping?
Well, it might surprise you to learn that the position that you feel most "comfortable" in at night, is actually the least "comfortable" position and the reason why you're waking up feeling stiff, sore and headachy.
This can be one of the most important lessons for those suffering from morning head and neck discomfort/stiffness and headaches. If this is ignored, you can do all the massage, chiropractic, physical therapy and exercises you want- it will persist until this positioning at night is fixed!
Contact me if you have questions about what sleeping position is right for you to stop your usual morning neck/headache stiffness and discomfort.