I have a small problem, but wondering if you can help. If my iMac is in sleep mode and then I turn my desk lamp on or off the iMac wakes from sleep. At first I thought it may be to do with the iMac and the light being on the same power supply, and the turning on or off of the light causing a dip or spike in voltage being detected by the iMac. Is this possible? However yesterday my iMac woke from sleep when i turned off the main light in the room off, which is of course on a different ring circuit. Any ideas? Is this a potential danger for my iMac?