Speaking only for myself, and knowing how different afibbers are from one another, the problems with that would be:
1. I'd never go to sleep, caffeine has a very strong effect on me, even the amount in 1 cup of tea.
2. Coffee has historically brought on afib with me, within a very few minutes on the last occasion that i drank some of it.
As good as coffee still smells to me, i'm afraid to drink it.
Peggy