It could possibly be extra acid in your stomach. How long is it since your last meal, when you're waking up in the mornings? Does it go away when you eat or drink? If you do have extra acid, when your stomach is empty extra acid production will cause irritation to the lining of your stomach. If you think this is the cause then try to eat small meals throughout the day and have a very small and bland snack before bed (crackers, rice cakes, celery, etc). Keep some water by your bed so you can have a sip when you wake up. There are also some over-the-counter medications you could try to lessen the symptoms as well (Prilosec and similar). Two things you should avoid during this is chocolate - that will make it much worse - and stress (I know, easier said than done...). And, of course, getting checked out by a dr. is a very good idea, in case it is something more serious like a gall bladder problem. Best of luck!
you need to go to doctors it may be your gallbladder hernia sorry no better help
get your gallbladder checked if it doesnt go away.