Hi people. I always make my iMac go to sleep when I'm not using it including when I go to bed. Today when I came home from work I pressed on the keyboard to wake up my Mac but nothing happened. I then found out that it was shut off. I checked my alarm clock and the numbers weren't flashing, meaning there wasn't a power outage. No one in my family would touch my computer but it would not have been my family. This is the second my iMac has shut off after a day's sleep. I wonder what happened? Is there a log somewhere in OSX that shows last activities, or last shut off/log out? Thanks.