I only know that the Engineer won't die when u sleep.
&...... using restoration to heal your resurrected creatures whose hitpoints are over 3500+ seems 'a bit' too tiring :s
I 'happened' to know a quicker way to heal your resurrected creatures...
HOWEVER, it is limited to Ors only. Everyone knows the heavydrummer who can restore the hp of his comrades (& himself too) to full, BUT.. it can restore the hp of your resurrected Orcs too! A wise way to do is to kill a heavydrummer near the Orcs Camp waypoint and resurrect it but without casting aura of command on it. So, when your orcs companion needs healing, u can always transport here and let it heal your orcs BEFORE killing it(at this time, it should turn hostile now) <-- Just remember to resurrect it before leaving
Right now, i have 2 Elite Orc chieftain, both with over 3500 hp and it sounds crazy just to cast restoration to heal them, even if u have LV 5 restoration
The side-effect is, however, that your character CAN'T sleep from now on...
My warrior hasn't slept for nearly a month! poor thing :o