That 3:00 - 5:00 work time... it's early enough in the day to think about maybe "just this once" going to the vending machine.

After 5:00 I'm close enough to leaving that I know I can tough it out.
Second place is just before bedtime. I feel like snacking and am concerned that being hungry will prevent me from falling asleep. Been getting around that to some extent, by playing a white noise CD in the background to drift into sleep quicker.