Look 411a,
Early start, out of bed at 0430
Not technically early start, but still out of bed at 0430
Early start, out of bed approx 0400
Not technically early start, but still out of bed at 0430
So far, No probs. Body has now adjusted to 0400 wakeup, by making me sleepy by 1900-2000 ish the previous evening. Solution? I go to sleep, and wake up 8 hours later feeling fine.
Here come the problem:
Next day: Report 1900, Fly till 0200.
Course my body will wake at 0400, so by report time I've been awake for 15 hours (it being scientifically accepted that you won't sleep reliably when you aren't tired). By 1 hour into the duty the body is saying 'Pitbull, its time for sleep'. By the end, its saying 'WTF pitbull, you should have been asleep 6 hours ago'.
Whole operation conducted within 2 adjacent time zones.
Are you SERIOUSLY trying to say that circadian cycles are not an issue?
As per usual, you assume that any comment by a current pilot must be baseless whining.
Let me spell it out:
Early starts? No problem.
Late finishes? No problem.
Chopping and changing? Big problem.
CPB