Originally Posted by flossie
I'd suggest seeing your dentist. Your TMJ (temporomandibular joint) could be the cause of your problem. He may suggest physiotherapy or wearing a splint (nightguard) when you sleep.
How do you sleep? Do you sleep on your hands or arm? If you do, this could cause your jaw to get misaligned as you sleep. You are pushing your jaw to one side and in the morning it takes a little time for it to work itself back into place.
Since you say the problem is worse in the morning you could also be grinding at night. Do you wake in the morning with headaches? Do you have a tooth or teeth that is hypersensitive for a day or two and then settles down? Do you have pain in your neck and shoulders? Can you feel notches on your teeth near the gumline? These are all signs of night grinding.
Again, make an appointment with your dentist and have him/her check your TMJ.