Your Mac goes to sleep Suddenly
You should make sure that Energy Saver is set up the way you want: choose Apple () menu > System Preferences, then click Energy Saver. Set one or more of the following controls to affect when you face to Mac sleeping. Some of these controls might not be available on your Mac.
- “Turn display off after” slider
- “Display sleep” slider
- “Computer sleep” slider
If a slider is set to “Never,” sleep is disabled for that feature.
- Schedule button
Become sure that you don’t put your Mac to sleep accidentally:
- Pushing the power button can put your Mac to sleep.
- Turning your mouse pointer to a hot corner can put your Mac to sleep, based on your Mission Control settings. Select Apple menu > System Preferences, then click Mission Control. Click the Hot Corners button, then see if any of the corners are set to “Put Display to Sleep.”
- Using magnets near your Mac notebook can put your Mac to sleep.
When your Mac doesn’t go to sleep as you expect
It’s better to check your Energy Saver settings as explained above and you should know that your Mac won’t go to sleep automatically when it’s just inactive:
- The same network activities that can wake your Mac can also avoid your Mac from sleeping.
- Any app or other process that’s running on your Mac could also be keeping your Mac awake. Check the Energy Saver pane of Activity Monitor to identify apps that need your Mac to be awake. If “Yes” appears in the Preventing Sleep column for an app, your Mac won’t sleep automatically during the app is running. Other apps prevent sleep only when doing certain things, such playing music or video, printing, or downloading files.
When you started from macOS Recovery on a Mac notebook, automatic sleep is disabled till the Mac is using AC power.
When your Mac wakes suddenly
Your Mac might wake for these activities:
- Examples of network activity contain iTunes sharing, photo sharing, printer sharing, file sharing, and using Back to My Mac.*
- Enhanced notifications from FaceTime, Messages, and other apps and services.
- Bluetooth activity. To prevent Bluetooth devices from waking your Mac, choose Apple menu > System Preferences, then click Bluetooth. Click the Advanced Button, and then deselect “Allow Bluetooth devices to wake this computer.”
If you have a MacBook Pro (2016 or later) or MacBook (Retina, 12-inch, 2017), note that these models are designed to start up when you open their lids or connect them to power.
*As of July 1, 2019, Back to My Mac service isn’t available anymore.
When your Mac doesn’t wake when in proper time
Your Mac might pause a few seconds before it wakes up. If it doesn’t seem to wake at all, check these following possibilities:
- Your screen brightness might be turned down.
- If you’re using an external display, your display might be turned off.
- Your Mac might be in safe sleep. To wake from safe sleep, press the power button.
- Check for a sleep indicator light, if applicable, and make sure that your Mac isn’t turned off.
When the previous steps don’t work really well
Bellow steps may help classify or decide the issue:
- Reset the SMC.
- Reset NVRAM.
- Remove external devices other than your Apple keyboard, mouse, and display. If that resolves the issue, reconnect your devices slightly, testing each time, until you find the device that is interfering with sleep. Then check the documentation that came with the device, or contact the device manufacturer.
- Start up in Safe Mode to see if the issue is related to non-Apple startup items, login items, or kernel extensions.
- Try to isolate the issue by using another user account.
If you still see the issue, contact Apple Support.
FaceTime is not available in all countries or regions.
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