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Monterey 12.5 not sleeping

My iMac was running Monterey 12.5 before a fouled up computer caused me to have to replace it's "failing" HD (part of a Fusion drive) with an SSD. I then installed only programs that were essential to me.

The computer that was extremely sluggish and unreliable before the new SSD would sleep very reliably and, when it was put to sleep manually, stay in sleep mode. So, the version of macOS seems to be ruled out as a culprit

The newly installed Monterey 12.5 with minimal programs will not put itself to sleep or even stay in sleep mode when put there manually.

I found a previous thread that mentioned an AV program as interfering with sleep, but I don't have any AV installed other than free Malwarebytes.

In Windows, there are terminal commands to tell what was the last process to wake the computer from sleep. Are there any such commands for macOS that would give me a clue as to what's wrong?

iMac 27″, macOS 11.2

Posted on Aug 20, 2022 9:44 AM

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Question marked as Top-ranking reply

Posted on Aug 21, 2022 8:03 AM

milleron wrote:

My iMac was running Monterey 12.5 before a fouled up computer caused me to have to replace it's "failing" HD (part of a Fusion drive) with an SSD. I then installed only programs that were essential to me.
The computer that was extremely sluggish and unreliable before the new SSD would sleep very reliably and, when it was put to sleep manually, stay in sleep mode. So, the version of macOS seems to be ruled out as a culprit
The newly installed Monterey 12.5 with minimal programs will not put itself to sleep or even stay in sleep mode when put there manually.
I found a previous thread that mentioned an AV program as interfering with sleep, but I don't have any AV installed other than free Malwarebytes.
In Windows, there are terminal commands to tell what was the last process to wake the computer from sleep. Are there any such commands for macOS that would give me a clue as to what's wrong?




If your Mac won’t go to or stay in sleep

If your Mac sleeps or wakes unexpectedly - Apple Support



Uninstall all third party apps that are Cleaners/Optimizers/Anti-Virus/VPN

all known to cause issues on the macOS



The current stable release of Monterey including bug fixes, is macOS 12.5.1 —I would start there


Keep your Mac up to date - Apple Support

Keep your Mac up to date - Apple Support



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7 replies
Question marked as Top-ranking reply

Aug 21, 2022 8:03 AM in response to milleron

milleron wrote:

My iMac was running Monterey 12.5 before a fouled up computer caused me to have to replace it's "failing" HD (part of a Fusion drive) with an SSD. I then installed only programs that were essential to me.
The computer that was extremely sluggish and unreliable before the new SSD would sleep very reliably and, when it was put to sleep manually, stay in sleep mode. So, the version of macOS seems to be ruled out as a culprit
The newly installed Monterey 12.5 with minimal programs will not put itself to sleep or even stay in sleep mode when put there manually.
I found a previous thread that mentioned an AV program as interfering with sleep, but I don't have any AV installed other than free Malwarebytes.
In Windows, there are terminal commands to tell what was the last process to wake the computer from sleep. Are there any such commands for macOS that would give me a clue as to what's wrong?




If your Mac won’t go to or stay in sleep

If your Mac sleeps or wakes unexpectedly - Apple Support



Uninstall all third party apps that are Cleaners/Optimizers/Anti-Virus/VPN

all known to cause issues on the macOS



The current stable release of Monterey including bug fixes, is macOS 12.5.1 —I would start there


Keep your Mac up to date - Apple Support

Keep your Mac up to date - Apple Support



Aug 21, 2022 2:36 PM in response to milleron

milleron wrote:

Thanks for the smart suggestions. I did check that it's scheduled to sleep. It always was, but that wasn't the problem. The problem was that when it was put to sleep manually, it would wake up again within 40 seconds, and when it entered scheduled sleep, it woke in less than 40 seconds. It does have wake on LAN enabled, but that's not the problem, either. It doesn't sleep with
Logitech bluetooth-connected peripherals -- namely, keyboard and mouse. If those are removed, it sleeps perfectly.

Further experimentation to follow.


If in doubt refer to the developers website; Support/Help/FAQ/known issues/compatibility/updates

Contact a third-party vendor - Apple Support



Support - Logitech


Contact Logitech - Corporate Offices & Support Enquiries


Logitech (@Logitech) · Twitter




Aug 21, 2022 1:42 PM in response to leroydouglas

Thanks for the reply. I have NO "cleaners, optimizers, antivirus, or VPN apps installed other than free Malwarebytes, which I understand is known to be safe and is widely recommended.


By trial and error, I found out exactly what is waking my iMac. I have Logitech MX-series keyboard and mouse. They're the same ones I had been using before I reformatted the HD and reinstalled Monterey when there was no problem with sleep mode, but I think that the previous version was 12.4, and this time I ended up with 12.5.

If I simply turn OFF both the mouse and keyboard and then put the iMac to sleep with a little $4 USB mouse OR the Apple Magic Mouse (also connected by BT), the computer sleeps perfectly normally. Interestingly, switching either the MX mouse or the MX Keys keyboard to its "ON" position instantly wakes the computer with both of them paired.

I suppose it could be a bug introduced with macOS 12.5 but it doesn't seem to affect Bluetooth-connected Apple peripherals, just the ones from Logitech. I'll do the upgrade to 12.5.1 and post results here.

Aug 21, 2022 2:28 PM in response to LyleFromVegas

Thanks for the smart suggestions. I did check that it's scheduled to sleep. It always was, but that wasn't the problem. The problem was that when it was put to sleep manually, it would wake up again within 40 seconds, and when it entered scheduled sleep, it woke in less than 40 seconds. It does have wake on LAN enabled, but that's not the problem, either. It doesn't sleep with Logitech bluetooth-connected peripherals -- namely, keyboard and mouse. If those are removed, it sleeps perfectly. Further experimentation to follow.

Aug 22, 2022 7:53 AM in response to Old Toad

Old Toad, I read you loud and clear. I had already told my brother (my partner in crime in performing the upgrade from the HD to the PCIe SSD) that shutting down was what I was going to do, but I'm enough of a perfectionist that I didn't want to let this problem go unsolved.


Interestingly, after the update to Monterey 12.5.1, as suggested by leroydouglas, the iMac did put itself into sleep mode per the schedule and criteria in System Preferences/Power. It stayed in sleep for 12 hours until I tapped the keyboard just now. However, and very mysteriously, if I try to enable sleep when leaving the area for a while, it still wakes up within 40 seconds after entering sleep. As before the OS update, simply turning off the Logitech keyboard and mouse makes it stay in sleep.


In a recent macOS update, Apple removed the option for preventing bluetooth devices from waking the computer, which would probably solve my problem if I still had that option. But I'm now suspecting that when it follows the Power plan for entering sleep, the OS does perform that function, making the computer ignore the bluetooth signal but allowing it to wake when it senses a keystroke or mouse click. I figure that it doesn't have time to do that or is not programmed to do that when the user sleeps it manually. It's what would explain this strange behavior. I think I can live with that


But for now, I'll probably follow your advice and shut down at the end of the day because the iMac boots so fast that it's not inconvenient to do that. In fact that was my practice for 20 years before switching from the Windows world to the Apple universe.

Monterey 12.5 not sleeping

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