The first thing your operation should do is go to a 2 pilot crew for night and IFR.
Night/IFR , Single pilot SAR/EMS should not be attempted. At 04:00 your body's natural bio rythmes are saying sleepppp. Its like flying after you've had 2 or 3 beer.You need that extra body there to help keep you alive.
Just check out the postings on " sleep " and "capricorn rescue" .