IMac doesn't recognize input devices after going to asleep, must reboot

Quite often, my iMac doesn't respond when I attempt to "wake" it using keyboard or mouse. The only way to wake the iMac is to tap the power button. However, when it wakes the mouse cursor is a spinning color wheel and the system does not recognize any input from the keyboard or mouse. I can leave it sitting for quite some time and it still will not recognize my input devices. When this happens I must hold the power button to reboot.
This has been happening for a quite a while now, and it is highly annoying. I can't remember if this was happening before my screen was replaced by Apple a few months ago. It definitely did not happen before upgrading to Lion.
I am hoping you guys can help, otherwise I suppose I will be calling Apple and see if they can figure it out. I am tired of this!
Thanks,
Robyn

I'm having a similar issue. I put my screen to sleep before I go to bed, next day, the computer is frozen, but still on since I can detect heat from the top vent.
I've checked memory for any errors (5 hours of testing) and removed any system extensions. Still gets frozen.
I did attach an old USB mouse just to wake it up when it loses connection to the wirless bluetooth devices. I've been able to wake it up from this condition a few times.
I will keep investigating. My iMac is 1 month old, 27" i5 quad core.

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IMac doesn't recognize input devices after going to asleep, must reboot

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