Having that last latte is a good thing.
I don't drink coffee, but I like a coke. It doesn't take much to mess this old dog up. I'm much more restless during meditation if I had a coke during the day. I have one now and then, but if I have one two or three days in a row.... meditation and sleep get messed up. That's my experience.
Diet caffiene free coke or pepsi for me, since I feel the depression of riding the down side of sugar as well. Whether it's age, or I'm just becoming more attuned with my body with age I don't know.
I do have some on occaision, but I make sure I'm aware of the cost.
Oh, and there are two retreats that get bandied about. LSC had a retreat this summer, and Chunyi Lin had a level III retreat at the same time... not co-located.
Sending love,
Iam2