Hypergraphia--compulsive writing

At the end of January, I heard an interesting clip on NPR about hypergraphia, "The Midnight Disease." As NPR says,

Many authors fear writer's block. But its opposite -- hypergraphia, the driving compulsion to write -- can be equally debilitating. A new book called The Midnight Disease considers the relationship between the wiring of the brain, writing and creativity. NPR's Renee Montagne talks with author and neurologist Alice Flaherty.

It's an interesting interview. Who knew that a person actually could write too much???