It can be very annoying when you want to put your Mac to sleep, but it just won’t go to sleep. Most people find it especially annoying when they are not the type that like to shut down a Mac. Without shut down, sleep is the only way to give your Mac a break. So, what can you do to fix it? Here’s what.
How to fix Mac not sleeping issue in Mac OS Sierra?
The first thing you need to do is look at your energy saver settings. Go to Apple Menu, then System Preferences and then Energy Saver. Go through the different settings and see if any of the settings is preventing your Mac from sleeping. For example, you might have selected the option to prevent your Mac from sleeping when the display is off. If that was the case, your Mac won’t sleep even when the display goes to off.
A second problem could be that other users relying on your Mac for a network connection might be waking it up by using their computers. To disable this type of waking, go back to Energy Saver settings and disallow the option to wake for network access.
Please also know that connected Bluetooth devices can also wake your Mac, even if you are only using the Bluetooth device and not your Mac. To disable this type of waking, go to your Bluetooth settings in System Preferences and disallow waking by connected Bluetooth devices.
Sharing a family printer can also mean that someone keeps waking your Mac! To disable this as well, go to Sharing in System Preferences and disallow the options that you think shouldn’t be waking your Mac up.
Other reasons why your Mac never goes to sleep could be because a rogue app doesn’t allow your Mac to sleep. Also, please understand that apps like iTunes that actively use your Mac’s hard drive will not let your Mac sleep as it needs to keep it awake to access the music from your Mac’s hard drive.
Once in a while, your Mac will also run Spotlight indexing where it keeps records on where you have what on your Mac, to assist you with Spotlight searches. If your Mac is supposed to sleep but Spotlight is running its indexing feature, it will override your Mac’s sleep function and keep it awake until indexing is complete.
Lastly, simple things like an old cable that connects your Mac to your keyboard, mouse or other frequently used device could also keep your Mac awake, as it keeps sending input signals even when you are not physically using the device. In those instances, you just have to swap out the cable for a new one.