I have my iMac 20" Core 2 Duo scheduled to wake up at 7:15am. It wakes up to the locked desktop login screen, which is what I want; however, after a brief period of time, it goes back to sleep, which is what I don't want. I have it set to sleep at 10pm at night. I have background processes that run during the day, so I don't want the machine to go back to sleep! Has anyone else encountered this situation and/or knows how to fix it?