"I'm not..." He almost said he wasn't tired, but then he'd said that once and her reaction was predictable. "No," he said instead. "I don't want to rest." He didn't sound as defensive as he had earlier. Just flat.
He knew what would happen if he slept. It had already happened. And he wasn't particularly looking forward to a repeat performance. "You should probably rest yourself," he said instead. "You must be tired."