What can I do or eat before bedtime to stop waking up in the morning so hungry

If you're not having a bedtime snack, you could try that. Allocating some calories for snacks where we need them is fine. If you've heard that we shouldn't eat close to bedtime because that food all goes to fat, that's not true, as long as we're in a calorie deficit on average over our full days.

If you sleep poorly or experience heartburn from eating close to bedtime, that's another question, with various possible solutions, but there's no point in going into that if it doesn't apply to you.

Also, I'm a little curious, though you don't have to answer if you don't want to: In what way is the morning hunger an obstacle for you? Does being hungry make you wake up too early? Do you tend to over-eat in the morning because of the hunger? Something else?

Reason I'm asking: For many of us, we've gotten very used to overeating - it's what caused and kept the excess weight in the first place, right? One side effect of that is that we were rarely or never experiencing hunger or even the milder stomach-growling "almost time to eat" feeling. Like any new experience, we may not be great at how to handle that feeling, may find it extra unpleasant because it's so unfamiliar.

Sometimes people here talk about needing to explore that a bit, to learn to distinguish profound hunger from the appetite feelings that initially come from not eating as much as we used to, or on the same schedule. I'm not discounting or criticizing those feelings: They're very real. Sometimes they mean we need to eat right now for real; but sometimes they can be a thing we can notice and respond to with less urgency or less extremely; some at the milder end of the scale may even go away in a couple of weeks or so as our habits change and our body learns to expect different foods on a different schedule . I hope that makes sense.

Best wishes!