I used Apple's chat tech support last night at about 12:30am. I had a few instances where my iMac would not wake up from sleep. I think Darth Vader had a similar problem on a PowerMac.
Sometimes it would not respond to a touch of a key on the wireless keyboard. Using the mouse wouldn't wake it up either. Hitting the power button would power it down(hibernate?) but upon power up it would go back to the password screen. Holding down the power button made it turn off.
The support person on the chat suggested I reset the PRAM. This is done by holding [Command]+[Option]+P+R while restarting. So far so good. It woke up this morning properly.
I'll keep an eye on it.
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