MBP battery drains in sleep when charger has no power

At home I regularly plug my MBP's charger into an outlet that's on a light switch. When I'm done working for the night, I put the laptop to sleep and then turn off the light. Usually (since I'll be leaving first thing in the a.m. and the charger cord is kind of in the way) I unplug the charger and stow it, but every now and then I just leave the laptop plugged in and turn off the light.
I've discovered that when I do this--leave the fully-charged, sleeping laptop attached to an adaptor that is not getting power--the battery drains until the point that the laptop goes into hibernation. So when it wakes up, less than 10% charge is left.
In all other respects I have no problem with the battery and resting overnight (unplugged) it only loses a percent or two of its charge.
Is this a bad adaptor, possibly?

George Krompacky wrote:
Csound1 wrote:
Sleep and hibernation are 2 different things, sleep requires power, hibernation does not, Apple and Oranges.
I'm not sure how that helps me figure out the problem. I suppose I'm still having problems expressing myself clearly.
You have expressed yourself very clearly. I got it from reading your original post.
The only thing I can come up with is somehow the charger or the Macbook is bleeding power back through the charger into the electrical lines.
There should not be any voltage at the AC prongs of the charger when it is connect to the MBP. The flow of current should only be one way. You can check this with good multi meter.

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