PB gets HOT while asleep

Hi all,
I'm sure this question has been asked before, so please forgive me ahead of time if this is a repeat. I've been doing some searching around the web on this, and I was able to find plenty of people asking questions about this, but never any solid answers.
The problem is with my powerbook when I close the lid to put it to sleep. Every once in a while, shortly after closing the lid, the sleep light stops flashing, then the fans come on (the bottom gets VERY hot), and when I open the lid I get nothing on the display and no response from the keyboard. I have to force a shutdown but holding the power button down to regain control.
I know that plugging in USB/FW devices while it's asleep will wake it up, but I have no devices connected (other than the power cord). Both my airport and bluetooth are turned off, and I don't use any PC cards.
Does anyone know what causes this and if there's a fix of any kind? So far the best work around I've found is to just shut the PB down instead of letting it go to sleep. The reason I'm asking is that over the past 5 years this has only happened a handful of times, but now I'm up to 3 times this week.
Thanks in advance for any responses!

Hi, ggarthe. You have quite an odd problem, and I'm not sure what could cause it. The Powerbook shouldn't be able, let alone willing, to wake from sleep with its display closed and no peripheral devices connected, and doing so is certainly not good for it.
Next time this happens, as soon as you're able to start the PB up again, open the Console application and look at the Console log, which is a chronological record of events in the computer's recent life. Near the end of the file you should find a "System Sleep" notation representing the last time you put the PB to sleep, and following that will be entries telling (in Consolese) what happened next. People who understand Console logs (not including me) may be able to discern a cause for what your Powerbook is doing from reading the log entries shortly before and after the Powerbook awoke with its display closed. If you'll post 40-50 lines of log entries centered on the System Sleep entry and the unwanted wakeup that followed, I'll try to round up some expert interpretive help for you here.

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