I have a late 2012 27" iMac and a Moshi Luna keyboard. Whenever my computer goes to sleep, it immediately wakes back up before going back to sleep after some time and immediately waking back up again. This continues indefinitely. I believe this is because the ambient light sensor detects the change in lighting as the Moshi Luna's backlighting turns off and therefore wakes the computer back up. Is there any way I can turn off the ambient light sensor auto-wake feature so this stops happening? I'd like to be able to actually put my computer to sleep without having to unplug my keyboard or cover the light sensor. Or is there something else causing this problem? I would think Apple would have worked something like this out considering all MacBooks have backlit keyboards and most third party keyboards are backlit.