MB went to sleep at 50% battery, woke up at 1%... Rogue process?

So i stepped away from my Core2Duo macbook for long enough that it went to sleep automatically. When i returned to it, i tried to turn it on, however, it wouldn't budge. i picked it up to take it to the power connector in another room and i noticed that the processor area was rather hot, almost like the processor was being utilized.
After plugging it in the power, i turned it on and the macbook recovered from its sleep mode and the battery was at 1%. When it went to sleep it was at about 50%.
Now my question is, what could have caused this drain? Can a process still run while the macbook goes to sleep? what do you guys think?
thanks,

I've had something like this happen before, but it wasn't something that happened all the time, just once or twice. you said that you did not put it to sleep manually, so I'm thinking there was a process that was running that prevented the CPU from sleeping. is it happening all the time, or just once? i'd recomend checking what processes are running in activity monitor and seeing if there i anything using alot of the cpu that may have drained it.
good luck

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MB went to sleep at 50% battery, woke up at 1%... Rogue process?

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