3AM Hunger Pains

I'm 22 weeks into my first pregnancy, and I had an insatiable hunger at 3am this morning! Could our swimmer be eating more than usual? We had a filling dinner last night (tuna melts and salad), and I was really full...my then this morning I was so hungry that I contemplated getting out of bed to have my morning bowl of cereal. I didn't leave the bed, though...I was cozy-warm. But I did toss and turn until our 6:30 alarm went off. Then I had my whole-grain flakes & granola cereal.