Sonoma unexpectedly going to sleep

Thank you 😎 for the opportunity to assist further

To avoid the question / answer and question answer scenario

Suggest the User start with the Top Suggestion and test.

Thereafter move down to the next and test again. Keeping going in the Order that they have been presented or until you reach the Final Suggestion

Restart in Safe Mode. This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts. The boot up will be slow and can take some time - Normal.

Safe Mode will also eliminate Third Party Software, extensions and drivers from loading. It will only load the Minimum amount of Core Apple Processes to allow the the computer to function at a reduced Level of Performance 

Does the issue present in this mode ?

Sometimes a Safe Boot followed by a Normal Boot will just put things right.

If not - there could be something in the main User Account playing up. To further isolate this - Set up users, guests, and groups on Mac. Then log out of the Main User account and log into the dummy account and test again if the issue persists.

If the issue is present in the dummy account - then, this appears to be a System Wide issue on the computer.

Download the Application Etrecheck directly from the Developer.

The Application is Not a " Silver Bullet "  and is  only a tool to examine the Hardware / Software used on this computer 

This is a Diagnostic Tool that makes no changes to the computer Hardware / Software used on this computer 

The application is free or paid from added features. 

The Report will Not Reveal Any Personal Information. 

Post back the Full Report - copy and paste - >>>> using the Additional Text Icon ( 3rd Icon to last ) <<<<

I think that PRP_53 was suggesting that maybe you have accidentally set a hot corner to put your mac to sleep. It is very easy to then just move the cursor aside and hit the hot corner - that could be the reason that your mac goes to sleep all the time.

Use hot corners on Mac

You can use the corners of the screen as hot corners, to quickly start actions when you move the pointer to a corner. For example, you can start the screen saver when you move the pointer to the top-left corner of the screen, or lock the screen when you move the pointer to the top-right corner.

1. On your Mac, choose Apple menu  > System Settings, then click Desktop & Dock  in the sidebar. (You may need to scroll down.)
2. Click Hot Corners on the right.
3. For each corner you want to use, click the pop-up menu, then choose an option, such as Notification Center, Launchpad, or Lock Screen.
4. To use a modifier key with the hot corner, press and hold the Command, Shift, Option, or Control key, or a combination of these keys, while viewing the pop-up menus.
5. Click Done.

The User ( you ) does have an opportunity to express their displease with the possible Solution presented.

Offering a suggestion, sometimes, may not provide Instantaneous solutions that meet their Expectations.

There are times, where some additional work needed on the part of the Author, too

So far and as of this writing

What else has the User ( you ) done to try and fix this issue.

Perhaps if you were to elaborate further, we would cease to Offer that which the User has already attempted

Above is not intended as a flippant remark but to ask the user to help us help you with this issue

FYI and is totally reproducible on this machine running Sonoma 14.2 and on 2 other machines also running Sonoma 14.2

On keyboard and hit Command and Eject button on Top Right of Keyboard

It will Log me Out of my account and then present the Log In Screen

If that is of any help

EDITED by me

someuserhere

Predicated on your user byline " iMac 24″

Using a M2 Mac Mini ( headless computer ) with Sonoma 14.2 with External Display via Direct HDMI from computer to 27 " Display

The setting in below does not perform as you have described in your Original Posting

Perhaps you need to adjust the " Turn Off Display when Inactive "

Thereafter, perhaps my esteemed colleague has additional suggestions which are very welcome to do so.