Late night snack!!

Anybody else waking up hungry and having to get up to eat during the night? I haven't had much of an appetite my whole pregnancy. At almost 18 weeks I am still under 4 pounds (and I am pregnant with twins). Now all of a sudden I am eating several times before bed. I eat dinner late and then I snack. It isn't helping, I still get up to eat. Any suggestions. It is really annoying.