Devil, how many pilots does it take to keep up that kind of rotation? And when during the week would the "other" pilots get their days off?
It's not true that the typical EMS assignment goes to nights midshift, it varies greatly and the scheduling is mostly the choice of the pilots at that particular base.
7&7, 6&6, 3/3&6, 4/3/3/4, and so on are all common choices.
The best solution for your circadian rhytms would be one month of nights and one month of days, but night currency (the real one vs the paper one) would greatly suffer from that, so the next best solution is 7N, 7off,7D,7off............