A goat herder in Ethiopia is said to have discovered coffee in the 1500s. He noticed his goats munching on coffee cherries. He noticed a change in their behaviour after that; they gained a lot of energy and didn't sleep at night. The herder informed the local monks of his findings. They realised they could stay up all night praying after making their own drink from coffee beans. The news quickly spread to other Ethiopian monks and then to the rest of the civilised world.