Having problems putting iMac to sleep?

I've noticed lately that I have to click SLEEP two or three time to put my iMac into sleep mode.  Is this the start of a bigger problem and what do I have to do to fix the problem.  Any assistance will be appreciated.

See if something here helps http://support.apple.com/kb/HT1776?viewlocale=en_US
I'd also try resetting the SMC http://support.apple.com/kb/HT3964

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