Don't try chocolate as that cause heartburn. Glass of cold milk should of help or gaviscon? That's what by doctor give me and try not to sleep flat put an extra pillow under your head. When I wake up I with bad heartburn I move so up I'm nearly in sitting position. And if you hungry I would say just eat something as long as it's something light not fatty no chocolate! Something healthy like some nuts r dried fruits...
If you have heart burn and are hungry you could try making a glass of hot milk, chocolate or tea. I find the heat of the drink calms my heartburn and fills me up a bit. If you have any biscuits or cookies try have them at the same time.
I find coffee can irritate it more though
I'm.the same way only I wake up at 4am STRAVING. ... it's normal but I take a teaspoon of baking soda or mustard