MBP 17" running OSX 10.6 : Sleep Issues

Suddenly this week my computer would go to sleep/hibernate after it sits idle a few minutes.
they when i open it , it either :
a ) shows nothing on the screen - just black/off
b ) shows the desktop but is basically frozen.
then when i close the cover.. the light goes on permanently ( as if it was still ON )
my only solution is to restart it.
ive also experienced the computer randomly restarting itself while i was using it normally...this happened 2x.
are there any apps i can run to test the hardware?
is there a log file i can grab and post here?if so where do i find it?
thanks!
art

Reset the SMC:
http://support.apple.com/kb/HT3964

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