Why does my Macbook Pro use so much power in sleep?

Hi everyone, forum newbie here
My mid 2010 Macbook Pro (13.3" C2D 2.66ghz, 4GB etc) uses a lot of energy during sleep
It drains between 2-5% per hour, which believe me is a lot. My battery lasts anything from 3-4 hours to 8 ish if I'm using it very little, so to deplete roughly 5% per hour is not that much less than the laptop uses when it's switched on... so what's going on here?
I'm sure it's asleep all the time, not waking up for whatever reason, the blinking/breathing LED on the front side of the laptop glows and dims so I know it's in sleep mode.
Can anyone help me? Thankyou!

Your situation is not unique. Another long thread https://discussions.apple.com/thread/1758587?start=90&tstart=0 suggests that a solution is not yet forthcoming.
You can, however, partially remedy the situation by (1) making sure your system is not too warm or hot - this really reduces the life of your battery; (2) Keep your unit charged for portions of the day; display quality is better while powered, and battery will keep more of its power; (3) In some cases, keeping your MBP connected to USB cables can leech power from your system; detach all cables before sleeping.
Of course, this won't solve the problem, but it will improve things. If it's any consolation, many (but not all) Windowz units report the same problem.
Post here if you have any comments, advice, or even feedback!

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