Set Your Mac’s Sleep Options
You can make OS X more energy efficient by configuring parts of your Mac to go into sleep mode automatically when you are not using them. Sleep mode means that your display or your Mac is in a temporary low-power mode. This saves energy on all Macs, and also saves battery power on a notebook Mac. For example, you can set up OS X to put the display to sleep automatically after a period of inactivity. Similarly, you can configure OS X to put your entire Mac to sleep after you have not used it for a specified amount of time.
Set Your Mac’s Sleep Options
Open the Energy Saver Preferences
Open System Preferences.
Note: ...
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