Why does my mac sometimes freeze when waking up?

Why does my mac sometimes freeze when waking up?  It only happens sometimes, but also happens spontaneously.  21' iMac 2011 model.  It just started recenlty after a new firmware update from apple.  Any advice or reasons why would be appreciated.

boot to lion recovery and run verify/repair on the hard drive. verify will say: appears to be okay OR needs to be repaired. No matter what outcome, you will repair anyways (as it will do some updating on the volume)
Process: hold command R during startup/ wait till you see mac os utility (might have to select english as the main language first) then disk utility/ select macintosh HD on the left, and then verify/repair on the right bottom side. Cheers!

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