Trying to make a Mac automatically suspend after a certain period of time can be frustrating. Several things can interrupt the process, including network activity and rogue apps. Fortunately, you can use a handy tab in Activity Monitor to quickly diagnose what might be preventing your Mac from going to sleep. That's how.
First, Open “Activity monitor”. You can locate the application in your Applications folder> Utilities, or you can use “Spotlight”. Click the icon of the “forget” in the menu bar, or press Command + Space. When a search bar appears, scribe “activity monitor” and press “Return”.
When Activity Monitor opens, click on the tab “Energy”.
In the tab “Energy”, you will see a list of active processes (background system apps and functions) with information on its energy impact. Look for a column header with the label “Sleep prevention” and click on it.
If you see a “Yes” in the column “Sleep prevention”, your Mac will not automatically put to sleep mode while that process is still active. If it is a process that recognizes, you can wait for an active task to finish or try “Get out” of the application. If it is a process that does not behave as expected or refuses to close, can force it to finish.
To force close a process in Activity Monitor (in any tab), select the process from the list and click the “Stop”, which looks like a small octagon with a “X” inside.
When Activity Monitor asks you to confirm, click on “Force exit”. Thereafter, if that process was the only thing that prevented your Mac's sleep mode from waking up, then your Mac should go to sleep next time you wait for it.
If your Mac still doesn't sleep
If you didn't find an app that prevents sleep in the Activity Monitor list, you can drill down into the problem using a command line tool called pmset. Nevertheless, that tool requires much more in-depth Mac troubleshooting expertise to find out the cause of the sleep issue.
Whatever happens, don't stay up all night trying to figure it out; remember to get some sleep yourself. If you have problems, try a glass of warm milk. Good luck!
RELATED: How to Find Out What's Stopping Your Mac from Sleeping
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