4
Nope, coffee won't give you extra energy. It'll just borrow a bit that you'll pay for later
(theconversation.com)
The Oromo people would customarily plant a coffee tree on the graves of powerful sorcerers. They believed that the first coffee bush sprang up from the tears that the god of heaven shed over the corpse of a dead sorcerer.
That's been my strategy as well. I find I have enough energy early in the day, but it's nice to get a boost in the afternoon.