Laptop waking up from sleep, then turning off

After I installed snow leapord the only major problem I came across was my computer waking up from sleep mode. Once it wakes up, its on for about 2 minutes then everything turns off. The weird thing is it looks like it goes back to sleep because the macbook pro light where you open the lid is still pulsing, like its trying to wake up. The keyboard lights are off, screen is off. I can hear the disk spinning also. Once it woke up to freeze and go back to sleep.
Is anyone else having this problem?
& it only happens when it comes back from closing the lid while the laptop is still on.

Try resetting some of the hardware involved. See this Apple KB for details, etc.:
http://support.apple.com/kb/HT1379
Can't hurt to try, and apparently this has helped others recently.

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