arnie, I came here for the same reason -- to see if anyone else could offer suggestions on how to get them to sleep long enough to actually raise their energy level to more than barely above exhaustion. I agree with Norah, it is extremely frustrating. I have praised them so many times that they are also telling me to "Stop nagging!" and running away from me too.
I think this may be something that the game developers should fix with an update. Either that or give us good advice on exactly what we need to do to make it so they are not always exhausted.