It's always difficult to settle back into the rhythms of your regular life when you go away from home and then return. Whatever you were doing before you left was set aside. Packing and unpacking upset the flow of life.
And then, abruptly, you're back home. But it still takes a few days to resettle. I drove both ways to RomantiCon so I had plenty of thinking time. When I arrived home, I had a couple new ideas for stories, but I found my brain's still fuzzy so I suppose it will take a couple days to settle down.