When you control your consciousness, refuse to give up to nervousness and worry. But then your body declares war, and lets subconscious act up and lead the battle. It attacks your sanity and health first. By cutting your sleep in half, your body is bound to deteriorate and your focus to diminish. What can you do as a counter attack? Against your own-self.
First you negotiate. If it doesn't work. You either surrender in order to move worrying and being nervous to the conscious level, or keep ignoring, until your body utterly fails... and then you fall asleep. Then you win.
Painting: Salvador Dali's "Crucifix"