Last night my iMac started up at 7:00 PM and I have no idea why it happened (according to my current uptime of 21 hours and 42 minutes). I came home from an out-of-town trip a few minutes ago, and my computer was running. My computer was set to go to sleep yesterday at 12:15 AM. However, no other options were selected (see attached image). Why on earth would this happen? Did it just turn on at 7 for no reason...? Is there a way to figure out what happened that told the computer to startup? Is there a log or something that would tell me why it started up? I'm posting this under Mac OS X because I assume it's the OS telling the hardware to do this.