Not just tired, exactly. His skin got waxy and his eyes sort of sank back in the sockets when that happened. Not exhaustion, then. Something else. He looked like a kid who just realized he’d jumped in the deep end of the pool and was trying to figure out whether he should embarrass himself by shouting for help or drown with a little dignity.

— Babylon's Ashes by James S. A. Corey (The Expanse 6)