I should contact the American Psychiatric Association to suggest they add to their DSM a disorder that I've experienced. Anecdotal evidence indicates this disorder is widespread.
The disorder presents itself when I'm working on an especially bad manuscript. When it rears its head, I can edit chapters only in very small segments.
The new entry in the DSM would begin, "WTDATDD: Willing-to-devote-attention-to deficit disorder . . . "