Sleep?

There are studies to show that chronic lack of sleep has an impact on your hormones. Hormones that seem to be the most commonly studied in this association are your 'hunger' hormones (leptin and ghrelin). It also has an affect on cortisol and HGH.
I can say that when I worked graveyard shifts, I did notice that I was hungry all the time and I ate more. If you are still losing and most importantly are monitoring what you eat, than you are fine here. While cortisol and HGH are important for immunity, recovery, metabolism, etc, there are a lot of other factors at play here. Adequate HGH is also affected by intense physical activity and believed to be sustained in part by a adequate protein intake. Cortisol is also influenced by other factors like workout duration, stress, immunity, etc. I had an easier time losing weight when I got on a normal sleeping schedule, but for me, I believe it was just because I was eating less.

Im a 3rd shifter and take care of 3 kids during the day. My sleep is less than sufficient Monday-Friday. I wait to weigh myself on Sunday mornings so I know I got some solid sleep. I dont know if sleep really hinders weight loss by a lot but I do know Im still losing weight as long as I stick within my calorie goals. I think im just more bloated when i dont get enough sleep. As long as Im still showing progress I wont worry about it. My sleep schedule wont be changing anytime soon as long as I have a toddler running around.

I have issue with sleep, too. Tend to crave more when I can't sleep.

Dude the weight just falls off when I get +7 hours. Whether it's a hormonal balance, a better grip on my self-control after resting, or the simple fact that I don't eat while asleep, it helps so much.

You can definitely lose with poor sleep (I did), but sleeping better helps.

Setting aside the issues with recovery (which can interfere with exercise progress) and whether there is a hormonal effect that may effect loss rate a little (I doubt this is going to be a major difference), it makes will power harder and often leads to low energy which your body interprets/experiences as hunger. I am much more likely to crave high cal foods if overtired.

What I think helps is to be aware of this -- to be able to tell yourself "I am not hungry, I am tired." For me that kind of mindfulness fights against the desire to just grab something and helps me stick to plan. Other important things are making it easy on yourself so you don't need to rely on willpower (this is when not having things at home that you are likely to grab for might help the most). Also, having foods you want to eat easily available -- I find that if I'm tired and think I'm dying for some high cal comfort food just eating something else usually makes it go away. My sister always has fruit out so she grabs for that. I've made it easy on myself by having super easy standbys that I now know to cook if I come home in the evening and am exhausted and tempted to call for Indian food. Having a premade option or some hummus and veg can help too.