Italics or no italics? I keep getting conflicting advice and examples out there in the world of literature.
I'm pulling my hair out. My favorite authors do it differently and my favorite writing books conflict on this.
So, in that case, I selfishly like that they're italicized--so I can easily skip them and get back to the real story.
This isn't to say that these devices are inherently bad, only that that they're difficult to make work.
Two books that use them well--I Am the Wallpaper (where the protagonist's diary is an integral part of the story) and The Mists of Avalon (yes, I was one of those).