Being honest with myself

How is it that I can do so well throughout the day with my eating habits but at night when others go to bed I think I need the extra helping or 2 of ice cream? And then of course I feel guilty immediately afterward. The other terrible thing is that even if I eat the one with 1/2 less fat it still has damaging trans fats that I know are going to clog my pipes. And my promise to myself that it will be different tomorrow doesn't happen b/c tomorrow seems to never come. My discipline in other areas such as work seem to be in line however my discipline with eating and money are out of balance big time. The same thing happens with the finances - I promise that this month will be different - that it will work and we will have a great deal of money left but seeming every month something comes up at the end of the month and there are extra splurges that exceed the budget. So I strive to find balance in my food intake - that I would be more honest with myself about what I am doing to myself.