I got really hungry early in my PG too, but it would only strike me in the wee hours of the morning, so I couldn't sleep!! The rest of the day I was fine. It didn't matter what I tried to eat, it wouldn't fill me up and it made me feel really awful! I ended up trying a small tub of yoghurt as a last resort one day when I'd tried most other things in the fridge at some obscene hour, and it worked! And you know what, every morning, for the remainder of my PG, between 5 - 7 am, I had to get up and eat a tub of yoghurt by the light of the fridge so that I could go back to sleep!!!