iMac sleep issue

I've had a couple of weird wake up issues since ML...Once the machine refused to come out of sleep at all until the power button was pressed. I re-set the SMC and all seems well now:

http://support.apple.com/kb/HT3964?viewlocale=en_US&locale=en_US

murraymint64 said:

iMac takes 20secs to sleep/wake up since mountain lion upgrade. Used to take 1 or 2. Any ideas?

Click to expand...

I've had some issues with sleep on my iMac with Mountain lion as well. If I put the machine to sleep, sometimes it will wake up and remain on until I put it back to sleep.