1)Move all the treats to the back of the fridge.
Out of sight, so when you continue to circle it like a shark and open it to see if anything’s moved, the sub-conscious temptation to have “just one” of those yummy, highly anticipated “rewards”, will be slightly more conscious as you’ll have to dig past the “oh-yeah-I-should-be-eating-that-instead” celery to get to it.
2)Be (semi) structured with your time.
But don’t beat yourself up if you’re not sitting at your desk ready to work at precisely the allotted time. I have a list and I set goals, rather than time. I often re-write my list midday if need be. I try and do the hardest thing first to get it out of the way. If there’s something more time sensitive, I do that.