I've had it for I think, a good month now, and I sleep my iMac all the time. Well last night, my iMac was asleep, I fell asleep-- I woke up in the middle of the night and my iMac was awake...? I just sleeped it and went back to bed-- I still have no idea how it woke itself though. This is the only time it's happened (that I've 'caught' anyway). Any ideas?