So how does Dan Brown do it? The writer of “The Lost Symbol” told Matt Lauer on “The Today Show” that he does his best work at 4 a.m. and if he’s suffering from writer’s block, will put on gravity boots like Richard Gere wore in the movie “Gigilo” and hang upside down.

“The boots are a trick because not only do they increase circulation in your head, but you think differently upside down.”