Classicly

Even as he energized the lock mechanism on the door of his quarters, Fred Hiller began to tremble, a violent physical reaction of taut and unrested nerves. It had been capped by the crisis of the crew's resistance, a matter hardly settled, mainly delayed.

He fell into his bunk and let the shakes take over. Right then they felt ghastly, but he realized he'd feel better when they stopped. As they subsided, he tried to keep the problem out of his mind. He was too tired for that; the pictures returned again and again in front of him mostly beyond his control.