Why am I so hungry in the morning?

Well, beyond the obvious fact that your stomach has been empty for several hours, it can be only one other thing. Eating a lot before you go to bed. If you go to bed after a big meal, your stomach is stretched a bit, and in the morning will remain so. As a result, more surface area and more room for food. Your stomach will demand the same quantity of food that you had the night before because it is still the same size.