I've had this problem from past few years now. I feel that I don't get to breath deep and satisfying breaths. Due to this I don't feel refreshed at all. Especially despite enough sleep most of days I don't feel rested after getting up as well. I've noticed that my body remains sort of tense and my neck, especially, front side feels stiff(Adam's apple is not relaxed) I've not sustained any injury or trauma to have caused this. Overall it seems to also affects my cognitive abilities such as clarity of thoughts, to focus etc.