For me, the perfect schedule would be 7 days, 7 off, 7 nights, 7 off. Once I shift to nights, I'm good to go. I know perfectly capable pilots who can't do 7 nights- small children at home or other things that interfere with efficient and sufficient sleep. That isn't a go at my base.
One should at least start transitioning to nights as well rested as possible, either by doing nights at the start of your duty rig, or with at least a couple of rest days between day and night duty shifts.
I've proposed a 4 night, 2 off, 4 day, 6 off. The objection is are that those schedules don't faithfully follow the 7 calendar day week.
One of my colleagues proposed a more complicated 3 night (or 4), 2 off, 4 day(or 3) and 6 off. If carefully arranged, everybody got every other weekend off. But that reduced the length of the break....