Firefly, I am gonna assume you are a woman. We women are terrible shift workers. When I was a kid and Dad worked shifts, he totally lived the shift, including days off, unless he was switching shifts the next week. The month he worked nights, he stayed on nights on off days. This is the key. You seem to be getting some exercise, but when do you go outside? Where are the veggies in your diet? what kind of diet plan are you doing?
I used to find that higher carb meals before bed helped me sleep, but not lose weight. However even on atkins, I saved most of my carbs for my last meal before sleep, and that helped.
Its hard for mothers, as we often feel we should shortchange ourselves on sleep and regularity of the schedule in order to parent, but the more you can keep to schedule, the better. I used to clump my shifts as much as possible. So I would work a whole week of 12 hr night shifts, instead of having them broken up over 2 weeks, then I would have a week off, and do my 2 weeks of days, and I tried to clump them too, because I hated getting up at 5 to be at work at 7. even with getting back to a day schedule, it was "off" for me, to be getting up so early.
good luck with your weight loss, but I do feel a better eating plan would help.
zen and the art of weight loss, finding the true path of en-lighten-ment