"this computer has been scheduled to go to sleep" when none is set

Simple question- My mac regularly & seemingly randomly tells me it has been scheduled to go to sleep automatically- usually (I think) right after I wake it up. I have no schedule for automatic sleep set up in preferences.

When this happens I just shrug and cancel the countdown box but it is annoying. Is there any way to see what is triggering this message and fix it?

If you are using iDrive that might be the culprit.

I had this issue as well. I found two potential answers:

This one suggests resetting PRAM and the SMC:

https://discussions.apple.com/thread/7702633

However, the second one mentions iDrive (as did a previous answer here). I did, in fact, switch to iDrive about a month ago, and believe the dialog box began appearing after installing it:

https://discussions.apple.com/thread/8304128?page=2

The above thread refers to a response from iDrive support which suggests un-checking the "wake from sleep" setting (it is apparently checked by default; mine was). For me, the issue was completely resolved by making this change; it has been 4 months since I changed the setting with zero recurrence. Make sure you don't miss the "do you want to save changes" dialog after changing it; iDrive has a way of making macOS feel like Windows.