Of course, epigraphs are used to excellent effect in the book. They start the sections (three) not each chapter; they are excerpts from articles in the Baltimore Evening Sun written by H.L. Mencken, who is a character in the book; the third person voice is a marked contrast to the first person narration.
Ok, I didn't snore when I read them.
And I like Mary Stewart's chapter headings too.
"Leave the snoring to me"