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Step 1
Open "Energy Saver" in the "System Presences" application, via the "Dock" or the "Apple" menu.
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Step 2
Proceed through the tabs one at a time, in order. You will make settings in "Sleep," "Schedule" and "Options."
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Step 3
Set your preferred amount of elapsed time, after which the computer will be placed in sleep mode. This ranges from a minute to 3 hours, or "Never" if that is your preference.
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Step 4
Choose your setting for when to independently put the display to sleep by checking the appropriate box ("Put the display to sleep") and setting the time. You can also check a box (at the bottom of the window) to have the system put the hard drive(s) to sleep "when possible."
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Step 5
Select the second tab at the top of the window, "Schedule," to set the times for automated startup and shut down. You have control over the days and the hours for these settings.
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Step 6
Select the "Options" tab at far right to set "Wake Up Options" and "Other Options." The former includes energy saving features which wake the Mac for incoming faxes and administrator access over Ethernet, as well as the option to have the "Power Button" put the Mac to sleep.
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Step 7
Exit the "Energy Saver" window and the "System Preferences" application at the same time by choosing "Quit" from the "File" menu. Closing the window with the red button window control will, indeed, close the window, but will leave "System Preferences" running, which you may or may not wish to do.
