There I was, well above Angels 40, sound asleep wearing a positive pressure oxygen mask and helmet with the droning of multiple jet engines in the background for company. Then, I was abruptly awoken by an aircrew member urgently calling my name.

On waking I noticed that it was colder and darker than I remembered when I had nodded off. The only light was that strange ambient light you only experience at high altitudes, and there was zero radio chatter in my helmet headset.