In her new book, The Midnight Disease, Alice Flaherty entwines mind and brain as she contemplates influences on the process of writing. Flaherty, a neurologist who experienced postpartum manic and depressive episodes, outlines similarities between bipolar disorder and the strange but fascinating seizure disorder known as temporal lobe epilepsy. She considers how the mind and brain contribute to the phenomena of hypergraphia (the pathological tendency to write a lot) and writer’s block. She applies traditional scientific methods to examine human thought and behavior, looking at what happens when the psychological and biological components of writing are hampered. In the case of an ailing brain or a broken heart, we can see what effect intrusion on a writer’s life can have on his or her productivity. The sophisticated language and focused subject matter of the book will not appeal to a wide readership but may hold interest for writers as well as scientists.