2008 model iMac doesn't stay asleep

2008 model iMac doesn't stay asleep At night, when I'm finished using my computer, I put it to sleep. Most of the time, it will stay asleep.
Asked by: Guest \| Views: 220

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Guest [Entry]

"Start the application Console (aka Console Viewer), located at

Applications/Utilities/Console.app

Look through the system log until you reach the point in time where you Mac woke up and see if it lists the reason for waking up."