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The screen sleep is set for a different period than the hard disk sleep. This can be changed in the Energy Saver Preference Pane. 1. Launch System Preferences 2. Select Energy Saver (its icon is a CFL bulb) 3. Select Battery or Power Adapter settings. The upper slide allows you to set the elapsed time until your computer sleeps, while the lower slide allows you to adjust the elapsed time for the display to sleep. There are several chackboxes to further refine when your computer or its display sleeps to save power.
I would check the energy saver settings under system preferences and see if it is set to go to sleep after a period of time. Also check the schedule button under energy settings to see if there is a scheduled sleep setup. Hope this helps
It may be that you have a scheduled boot up set. Go to system preferences and then to energy saver in the bottom right corner there is a button named schedule click on it see if it is set for startup or wake and if it does uncheck the box. Hope this helps.
Open System Preferences: Click on the Lightbulb Icon entitled "Energy Saver"
Adjust the preferences for each of the two options: Put the computer to sleep when it is inactive for: 1min 15min 1hr 3hrs Never Put the display to sleep when it is inactive for: 1min 15min 1hr 3hrs Never
Set these for Power Adaptor and Battery separately.
You should check your "Energy Saver Settings", and your "Bluetooth Settings" to see if there are external causes for its waking.
It also might help to change your "Energy Saver Settings" to "Better Energy Saving" while you're not actively using your Mac. At least that way it'll turn itself back off.