Hi Cranegirl,
The night hungers never happened to me. However, I had bad cravings on my first week.
To stay focused, I drank a lot of water (more than 12 glasses per day). I found out I was much less hungry those days when I drank a lot of water.
Also, when you eat, be sure to have at least 1 glass of water WHILE eating (not for shakes though). It helps a lot feeling "fulfilled". I found out thought that after a couple weeks, that wonderful feeling of being "fulfilled" is less important. An important step in stopping dependency to food.
Because let's face it, we're not fat because of our genetics or our bones. We're fat because of our lifestyle, and that horrible need of feeling overly "fulfilled". I found myself comparing a lot obesity with heroin dependance. Or cigarrette. When you take some time to think about it, we obeses people have a really bad dependency to food. Some are even agressive when they do diets. Some think diets are temporary, while as for drugs or cigarette, it's a complete change of mind.
As for your cravings, learn to understand your body. You are the pilot. Your body is adapting to your actions. Feed it a lot, he will be adapted to it and always ask for that amount of food. Feed it less, he won't understand why... But give it time to adapt, work with your body, and he will do what you want it to do; eventually dropping pounds of fat! But there HAS to be a transition, and it's no pleasure.
Sorry... I don't have any solutions for you, just those words of reflexion I can share