I found something that seems like it may part of the problem. I have time machine backups, normally to a disk that I attach via USB. I find that today, while the machine was supposed to be sleeping it supposedly made
several backups, including one just before I got home and found it scorching hot. So what, exactly, was it backing up to? (I assume the spare space or even trying to put it into the cloud) and why does backup scheduling overide user defined sleep?
My hopeful solution (we will see) is to select the option to NOT backup while on battery power. Now I will keep fingers crossed that it no longer wakes up and gets hot and bothered (I love my machine, but we're not
*that* close). It used to be that it never tried to backup until the correct external disk was attached, but that
doesn't seem to be an option any more.