Isn't this supposed to be Paolini's "serious grown-up book for grown-ups"?

I'd do this, if I was up all night, was tired as hell, and had just drank a gallon of caffeinated tea.

And "for grown ups" just means swearing and sex scenes. Which are also in YA novels, so I don't know what the point is.

Adult novels usually tackle mature themes, but I've read YA novels that do the same thing. A sci-fi YA novel, The Lonliest Girl in the Universe, has some themes of trauma, heavy responsibility, and even makes a mention of sexuality.

The graphic novel Skim tackles depression, suicide, and the main character tackles with her sexuality. It also has a large theme of unhealthy relationships.

Both of these examples show way more maturity than To Sleep in a Sea of Stars.

There's really nothing here but the label.