I was drifting in and out of a half-sleep. We were 3 hours into our flight and the drone of the engines acted like white noise in the dark cabin. I needed to stretch but didn’t want to disturb the others in my row. I lifted my arms above my head and stretched my legs under the seat to get blood flowing. I glanced to the right at my neighbor in the middle seat. He had his headphones on and was splayed in a contorted position-fast asleep. I’ll be fine for a while, so I stayed put. I decided to check our flight status on the screen in the seat in front of me. I knew we were over water; our flight left London in route to Atlanta at midnight and my phone said it was 3 AM.