Darn, if only there was someone whose job it was to sit at the game table and make judgment calls on things like when an unconscious character wakes up.Unconsicous = Dead = Petrified for all the player cares. If you never wake up, you are effectively "dead."
The results of the power do not magically go away after the encounter ends, even if the power itself does. You do not heal damage. You do not remove conditions that aren't explicitly removed. You do not revive dead enemies or team members. You do not wake up if unconscious with no save.

Here's yet another "fix" that I will likely toss aside. When I was first looking through the DMG for some monster that could render someone unconscious for more than a round or two, so a character could actually get abducted once in a while without having to go through a whole beatdown.
They really need some mechanic other than "save ends", for effects that just aren't meant to be a one-round affair. In this case, I'd probably allow a save if a fellow party member makes a Heal check on them.