OK, maybe a bit of jet lag :-)
The 5-4-5-3 system is pretty good though (which is why we're all very worried about management trying to get new entrants onto a random roster...). You do 5 earlies or 5 lates. Only one early/late transition a month allowed per roster (and never allowed on day 5). Don't get me wrong, we still get tired! But more because of long days than circadian rhythm.
It's easy to see how the combination of random roster and commuting can be deadly. Airlines should indeed monitor the situation and some of them actually do demand you live within a certain distance. The problem at EZY is that commands are often given at a different base, with no estimate of when you might be able to get back. Do you sell your house and move the family, even though in 3 months time you might get your transfer back? Tricky.
P