MacBook won't "wake up" from sleep mode since downloading Mavericks.

I have a 2008 MacBook and since downloading Mavericks, I've had a lot of issues when the computer is in "sleep mode." There are many times where it won't wake up and just remains a black screen. I'm forced to shut it down and turn it back on. When I do this, I have to login and it reloads everything I had had opened when it was put into sleep mode. Help! Thanks.

I have the same issue with my Macbook Pro 2.4
Have you by any chance installed a new RAM?. I've just added new 8 GB RAMs & I noticed the issue afterwards, but I'm still not sure if it's the cause.

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