Set Your Mac mini to Put Itself to Sleep When Unused
When you are not using your Mac mini, you can put it to sleep to save electricity. When you know you will be away from your Mac mini for a while, you can put it to sleep manually, but you can also set the Energy Saver feature to put your Mac mini to sleep after a period of inactivity.
Set Your Mac mini to Put Itself to Sleep When Unused
Click 
.
The Apple menu opens.
Click System Preferences.
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