Snoozes and surgeries

There is no better place for people-watching or eavesdropping than the Mayo clinic. For some the excitement is just too much:

 As I was watching this sweet couple catch a quick nap, I was treated to a graphic description of a guy's brain surgery, that began (and I'm not kidding) with,  "They had to go up through my nose with a hammer and break my sinus bone."

Is there such a thing as a sinus bone?

Could he have been exaggerating?

I just don't know.