Like Karen, I wander if you maybe slept different or in a different pose. I have had that in my shoulder and neck before and it is so bad that I can't turn my neck all the way. It will sometimes last for 1-2 weeks before I am able to move my neck like it should and I've always blamed it on the way I slept.
Also, sometimes if I sleep "like the dead" as they say and don't move during the night, I feel worse the next morning. More stiff and in pain more than usual. I always took a warm bath and used the heating pad which helped for a little bit, but nothing really seemed to work. It just would go away on it's own. Hope you get to feeling better!
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Fibromyalgia*Osteoarthritis Of Spine*Sleep Apnea*RLS * Depression*Chronic Fatigue*Allergy/Sinus*Menopause