IMac is slow to wake from sleep, or doesn't wake at all sometimes

hi guys
I have a mac from late last year, i have updated software to 10.8.3, and found another update to help wake the mac up. I have enabled hot corners, so you can you the mac to sleep by touching the corner, then swiping the track pad to wake....this will work for about 15 mins or so. If you leave the screen for 2-4 hours, approx half the time you need to push the button on the back to start it back up. Sometimes you will swipe the track pad, it will wake but the keyboard won't be working. So then have to restart and all is well again.
Am i missing something?

Have you read for possible solutions over in the "More Like This" thread over here?----------------------->

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IMac is slow to wake from sleep, or doesn't wake at all sometimes

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