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It' not really a mysterie, unfortunately. It's called "Modern Sleep" or "Modern Standby". It basically means that the OS uses this time without user interaction for syncing lots of stuff. Windows is particulary aggressive about this, which makes laptops sleep and battery endurance without disabling WIFI impossible to calculate. The battery drain including heating up the machine reliability is real and severly compromises reliying on battery power while on the move. In windows world this even fried laptops in backpacks.

The best and only true solution for for laptops running Windows and MacOS is to disable any network connection, that is WIFI when on the go.

Don' waste time to guess who is the culprit. The main responsibiloty for this behaviour lies with the OS.
That‘s crazy! How can some synching and maintenance tasks be so intense that they create more heat than when I am running large sessions in Logic… And they go on forever if I don’t wake the MacBook up.
 
If you have any Adobe products installed there was at one time about a year ago, a module that would consume huge amounts of CPU time. It was necessary to kill, and remove, the offending module.

Check the activity monitor when the laptop is awake, see how much CPU is being used. Sort to the CPU list by most used. If an Adobe module is on top, that is the offender. Excessive warmth is a CPU being used.

Adobe thinks they own the machine and everything on the machine. Why would anyone else use anything besides Adobe products is Adobe's way of thinking. Adobe does not care about other applications and could care less how their software impacts other applications on the system.
 
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Closing Creative Cloud and turning off wake for network access seems to have mostly resolved the issue for me - or at least I haven't noticed it.
 
Buy the biggest laptop cooler you can find and put the MacBook on that. And then get the biggest fan you can buy and mount it on top pointing down towards the laptop. Promise you no more burning hot laptop
 
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According to Sleep Aid the MacBook hardly ever sleeps. It just spent another 10 hours being so active that the battery staid warm the whole time without me doing anything. Apparently it's "Media checker" and Spotlight despite the photos library hard drive being disconnected and me never using Spotlight at all. What on earth is it doing. This makes no sense to me. Complete waste of energy.
 
I get laughed at for it, but this is why I always shut my computer (PC or Mac) down when I’ve finished using it lol
 
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According to Sleep Aid the MacBook hardly ever sleeps. It just spent another 10 hours being so active that the battery staid warm the whole time without me doing anything. Apparently it's "Media checker" and Spotlight despite the photos library hard drive being disconnected and me never using Spotlight at all. What on earth is it doing. This makes no sense to me. Complete waste of energy.
Getting huge “Who Controls Your Mind? 2023” vibes from that screen grab
 
miq wrote:
"I get laughed at for it, but this is why I always shut my computer (PC or Mac) down when I’ve finished using it"

Not laughing here.

I shut my Macs down at night and reboot the next day.

I'll even shut my Mini down if I'm going out for a few hours.

But I go even further.
The Mini is plugged into a surge suppressor/power strip. Once I power down the Mac, I reach down and flip the power strip OFF, completely disconnecting the computer (and peripherals) from the wall outlet.

Been doing it this way for decades. Pushing towards 80 now, so my ways aren't going to change.
 
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I get laughed at for it, but this is why I always shut my computer (PC or Mac) down when I’ve finished using it lol
I stopped doing that when I changed to Mac but when I'm seeing all this unnecessary activity I am considering going back... People recommend not shutting MacBooks down because macOS is doing "important maintenance" when the lid is closed. To me this seems more like unimportant nonsense rather than "maintenance".
 
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