iMac spontaneously wakes from sleep

iMac 27" Retina 5K, 2017, MacOS Monterey version 12.7.4

When I put the computer in sleep mode it wakes up spontaneusly sudddenly even if I have disabled WiFi and Bluetooth and shut down all apps. It then goes back to sleep. I have nothing connected to the computer except a printer via USB. I have BitDefender installed.

Why is this happening?

iMac 27″ 5K, macOS 12.7

Posted on Sep 29, 2026 11:26 AM

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Question marked as Top-ranking reply

Posted on Sep 29, 2026 1:43 PM

Perhaps Bitdefender is running a scan.


Most of the regular forum contributors recommend uninstall all anti-virus software, cleaning & optimizer apps, and third party security software because none of it is needed on a Mac. These types of apps usually cause more problems than they solve, plus they interfere with the normal operation of macOS. Uninstall all such apps by following their developer's instructions. I would definitely start here before doing any other troubleshooting.


It is also possible other apps & services are trying to do background maintenance. They won't know WiFi is off until they start their processing & discover no network.


2 replies
Question marked as Top-ranking reply

Sep 29, 2026 1:43 PM in response to nessle

Perhaps Bitdefender is running a scan.


Most of the regular forum contributors recommend uninstall all anti-virus software, cleaning & optimizer apps, and third party security software because none of it is needed on a Mac. These types of apps usually cause more problems than they solve, plus they interfere with the normal operation of macOS. Uninstall all such apps by following their developer's instructions. I would definitely start here before doing any other troubleshooting.


It is also possible other apps & services are trying to do background maintenance. They won't know WiFi is off until they start their processing & discover no network.


Sep 30, 2026 2:54 AM in response to HWTech

I understand, but why did it appear suddenly? I have used BitDefender for a long time.

It is annoying to have to shut down the Mac all the time since it takes a pretty long time to start.

If I remember correctly Windows ha a "hibernate" option instead of shutting down that was quicker.

Something similar in MacOS?

iMac spontaneously wakes from sleep

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