To help conserve energy, computers have several power options to use the least amount of power as possible and still perform to their fullest potential. One of the most convenient power options is sleep mode, which causes the monitor to shut off and all running programs to temporarily pause. Unlike hibernate mode, the computer can typically start back up instantly when it comes out of sleep mode. This feature is available on both Apple and Windows computers.
Open the System Preferences from the Apple menu. Click on the "Energy Saver" icon.
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Click the "Sleep" tab at the top of the Energy Saver window.
Adjust the slider bars according to your preferences. The top bar puts the computer to sleep when it remains inactive for anywhere from one minute to three hours. The bottom bar puts only the display to sleep when it remains inactive for anywhere from one minute to three hours. Tick the box next to "Put the hard disk(s) to sleep when possible" if you want the every hard disk inside of – or connected to – the computer to go into sleep mode.
Click the "Schedule" button on the Energy Saver window to set up a time for the computer to automatically wake up or go to sleep. Tick the box next to "Start up or wake" and select the time in the field at the right of the window to have the computer turn on at a certain time each day. Tick the box next to the drop-down menu below the "Start up" option and select either "Shut Down" or "Sleep" to set an automatic sleep time. Click "OK" to confirm the changes.
Close the window once you make the adjustments.
Open the start menu and type "power" into the search bar. Select the "Power Options" icon from the search results.
Click "Change when the computer sleeps" from the list of options on the left side of the Power Options window.
Click on the drop-down menu next to "Put the computer to sleep:" and select a time, ranging from one minute to five hours. If using a laptop, you can select different options for when the computer is running off the battery and when it is plugged in.
Click "Save Changes" and close the window after the changes are made.