My MacBook Pro will not "wake up" once it goes to sleep.  Mac OS 10.6.8  Please advise.  Thanks!

My MacBook Pro 10.6.8 will not respond to any key of pad once it goes to sleep.  I need to hold the power button down, then close the lid, open the lid and hit the power button for it to re-boot.  I have tried having Disk Utility fix permissions and that has not helped.  I would sure appreciate any and all asistance.
Thanks!
Bob

Sleep – Slow Wakeup/Requires Reset

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