How to prevent OSX from frying my MBP during sleep?

I own a 13" MacBook Pro since last July. I always put it to sleep by closing the lid. But it will not always stay asleep: sometimes I return to my MBP after a good night's sleep to discover that the sleep led stopped blinking and the notebook is red hot, with its fans blowing at top speed. Opening the lid will not awake the MBP, though. I get a black screen and the only thing that helps is a hard reset.

Does any one know why MBP seems to awake from sleep with the lid closed and starts overheating itself?

(I also posted a related problem: not being able to awake from sleep, but without first overheating)

Thanks for the suggestions.

I have nothing plugged into the usb ports, am not using any bluetooth device and "wake on bluetooth" = off. I found a setting about waking from sleep by the network, and put that to off also. I cannot easily check if this solves the problem, because the problem does not happen very often.

I did not touch the sudden motion sensor.

avediswolf said:

Running VMWare?
If you forget to properly shut down Windoze, it seems to do some funky things like you are mentioning.

Click to expand...

No VMWare or Parallels here.