Why do my husband and I eat and munch all nite long after dinner?

When I do cook, I usually cook like my Mom did - Meat,- Potatoes - Vegatable - Bread (sometimes). But at least 1/2 hour or 1 hour later, we are in the kitchen looking for munchies or whatever we can find to eat. Then the rest of the night until we go to bed, it's eat, eat, eat. We both try to stop ourselves but we are still hungry. WHY?