The problem consistently happens at breakfast, since sleeping 8 hours is 8 hours of me not eating. The only way this would work is if I wake up in the middle of the night and eat a full meal.
It might be worth doing some research at Chris Kresser's blog-- he's got respect for science and for individual variation, and a huge commenter base-- that last increases the odds of someone with the same or a similar problem.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.