I know this phenomenon well. Anyone who has ever lived with me knows that you DO NOT get in between me and a coffee pot. I warn people that:
- I'm not a real person until about a hour after my first cup of coffee.
- Resting ***** face has no reflection on my emotions or responses
- Enthusiasm is NOT appreciated nor is it reciprocated

Also, all conversations may be subject for repeat in a few hours time.
I just make it clear to everyone that it IS me, NOT them. AND DO NOT ask me "what's wrong." Making these things clear have saved me countless and pointless conversations, "I'm sorry"s and blood shed.

Once people know the warnings are for real, they actually find this to be a "cute" aspect of my personality... instead of recognizing it as my crushing depression.