It's 9 p.m. on May 20 and we've been in the death zone on Mt. Everest, the world above 8,000m for just over five hours. For the first time in my life, I am terrified to fall asleep. Why? Because I'm afraid I'm not going to wake up. This is the most terrifying moment of my life. With the sound of oxygen flowing through an artificial mask, I surrender and drift away wondering whether or not I will ever wake up.