Note to self:
No matter how tired and overwhelmed you are after a sleepless night and crazy morning at work, do NOT go home during your lunch break. DO. NOT.
You WILL sit down in your comfy chair to eat your sandwich.
You WILL end up falling asleep.
Even when you somehow manage to wake up in time to get back to work, it WILL NOT be with a cheerful spirit.
Just don't do it.