[BeFlatXIII]

While I was never in the military, I have been in environments where I needed to be an earlybird. It's exactly as you say: the adaption to the environment makes the early rising palatable. However, once left to my own devices, I quickly return to my nocturnal habits. For me, it's less revenge bedtime procrastination and more so that nights are better for long blocks of uninterrupted time than days.