2015 27" iMac won't stay asleep after upgrade to Catalina

[camner]

I upgraded recently from Mojave to Catalina (10.15.5). As with Mojave, my 2015 27" iMac won't go to sleep consistently by itself, but unlike with Mojave, under Catalina the iMac won't stay asleep. I can put the iMac to sleep from the apple menu, and if I come back within about 30 min or so, it will still be asleep, but after a longer period, it has always awakened itself.

In Energy Saver, I have "Put hard disks to sleep when possible" checked, but everything is UNchecked (in particular, "Wake for network access" is NOT checked).

I've read here that Catalina seems to have a lot of issues with sleep, but I haven't seen anyone describe this particular issue (most seem to be having the issue that under Catalina, their Macs won't wake up from sleep at all...).

Is there is fix for this, or is it simply something I have to deal with if I want to use Catalina?

 

[Taz Mangus]

I think the sleep issue that people are referring to has to do with getting kernel panics when the computer is woke up from sleeping.

Open the Console app and look in the logs for entries that might give up a clue as to why the computer is being woke up by itself.

Try applying the 10.15.5 combo update, it might help.

Download macOS Catalina 10.15.5 Combo Update - Apple Support

macOS Catalina 10.15.5 introduces battery health management in the Energy Saver settings for notebooks, an option to control automatic prominence of video tiles on Group FaceTime calls, and controls to fine-tune the built-in calibration of your Pro Display XDR. The update also improves the...

support.apple.com

 

[camner]

I think the sleep issue that people are referring to has to do with getting kernel panics when the computer is woke up from sleeping.

Open the Console app and look in the logs for entries that might give up a clue as to why the computer is being woke up by itself.

Try applying the 10.15.5 combo update, it might help.

Download macOS Catalina 10.15.5 Combo Update - Apple Support

macOS Catalina 10.15.5 introduces battery health management in the Energy Saver settings for notebooks, an option to control automatic prominence of video tiles on Group FaceTime calls, and controls to fine-tune the built-in calibration of your Pro Display XDR. The update also improves the...

support.apple.com

Thanks. I'll give it a try.

 

[killerrobot]

I've noticed the same thing with my late 2015 iMac. It will fall asleep but randomly wake up. On some trips to the bathroom in the middle of the night I've nearly had a heart attack trying to figure out who's on the computer or why it woke up. Resetting the SMC seems to solve it for a while, but then it just comes back.

 

[MacMan988]

Below command will show activities related to your mac's sleep.

pmset -g log


Anyone knows of any software/front-end to parse this log? Or can someone help to find the documentation for it?

 

[killerrobot]

One of these might help????

Mac OS X in a Nutshell

Name pmset Synopsis pmset [-a | -b | -c] action(s) Modifies the system’s power management settings. pmset is a command-line alternative to the Energy Saver System Preferences (Chapter 5 … - Selection from Mac OS X in a Nutshell [Book]

www.oreilly.com

Power Management in detail: using pmset

A command line tool with extensive abilities. It is not actually that hard to use.

eclecticlight.co