MBP not waking from sleep and getting very hot

When my Mac Book Pro 15 inch is left for a period of time greater than approximately an hour and plugged in it should automatically go into sleep/hibernate mode. Something happens during this period but I can hear the fan running heavily, the MBP is very hot and I can do nothing to wake it. The only option I have found is to hold the power button down for a few seconds to power the unit off then back on. When the MBP restarts I am greeted with the message "The computer was restarted after Mac OX X quit unexpectedly". I have also seen many kernel panics occurr on a regular basis. This is a new Mac Book Pro and was recently sent back to Apple for diagnosis. I was told it was my third party memory but upon instaling my original Mac memory the problem is STILL present.
Anyone else seeing or heard of this type of behavior???

Hi, I am having the sleep problem with my 17" MBP. When I shut the lid down and it goes to sleep mode for short periods it is ok but any period for longer than 1 hr it will not wake when I lift the lid or press any keys on the keypad. It was also turning itself on and going into sleep mode when I left it to charge overnight from a turned off state untill I sent it for repair. Now it just has the sleep problem, what I have noticed is that it does not play up when I start it up in Safe mode. I have just done the hardware test from the install disc and there were no problems, then I did the archive/Install bit and that did not solve it either. Ah well back on the phone tomorrow unless someone can shed any light!
Mac Book Pro, 2.16 Core Duo   Mac OS X (10.4.7)  

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