Hard drive runs wild when I put to sleep??-Why

Hi,
I have a 1 yr old MacBook Pro w OSX 10.5.1.
I boot it up at home, plugged in, and use it for about 90 minutes. When I leave, I put it to sleep and shut every thing else, like the monitor, etc down and pack it up. I make sure I "eject" any external hard drives, regular and Time Machine. When I get to the office, I replug it into an outlet, so the only time it's really on internal battery is for the trip from home to office, and reverse. I've noticed the past 2 days that when I get to the office and again, when I get home, the machine is hot as blazes and I can hear, what I think is the HD whirring away. I can hear it through my backpack, it's so loud. As soon as I plug it in, it "calms down," cools off and all is well. What's up??? And what should I do to avoid this????
Thanks.
Frank

Your MacBook is starting back up. I've had that happen to mine a few times. Try resetting your SMC.
Resetting the System Management Controller >>
You also might want to try using the 'Deep Sleep' widget. You can read about it here.
MacOSG: sleep vs. ‘deep sleep’ mode
-Bmer
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Hard drive runs wild when I put to sleep??-Why

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