Computer will not "wake up" when i re open the lid

When i close the lid, the computer will go to sleep. I will leave it there for a min. and then when i try to open up the lid and either move around the track pad or press a key on the keyboard, the computer will not wake up, the screen will stay blank. The light (on the side) will still be lit (but it does not dim in an out - like it normally does when it is sleeping). I then have to do a hard shut down with the computer and turn it back on. How can I fix this problem?

Reset the SMC:
http://support.apple.com/kb/HT3964
Does that make any difference?

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