I think a problem is lots of EMS pilots like the split shift because they are hoping for a quiet night and plenty of sleep, then they can enjoy the next day with the hope of a good nights sleep again. The problem arises when we have a couple of busy nights and we aren't fully adjusted still, not sleeping well during the day but still hoping for a quiet night.
I never sleep well on hitch and find i'm better off staying up and sleeping during the day, i'm not sure if i would like 7 nights straight.