1) Looking at System Preferences right now, the setting for Power Nap reads as follows:
> [x] Enable Power Nap while plugged into a power adapter
> While sleeping, your Mac can back up using Time Machine and periodically check fro new email, calendar, and other iCloud updates
This indicates that it should not have any affect on a sleeping MacBook in a bag (presumably disconnected from power).
2) That said, I have on rare occasions found a former work-issued MacBook Pro to be hot to the touch when removed from my bag after a commute. I assumed this was some bug (not a feature), and I can neither rule out nor implicate the involvement of the nanny software installed by IT.
I had these too, even though I have power nap disabled. But given how horrendously buggy the whole power cycle thing in Macs is I am not surprised. I've seen it after coming from sleep completely forget all display configs, freeze cold, switch displays, refuse to connect bluetooth devices until I remove and re-register them, and so much other fun stuff. So just waking up and wasting a ton of battery is par for the course. The whole sleep thing is deeply broken there, and since there's no transparency there's no way to see even if it's "sleeping" or just staying up and heating itself up.
That seems pretty easy to turn off. I just checked my Mac and it's disabled, and the description around the setting was clear enough for me to know I didn't want to touch it with a ten foot pole.
There's the key. Windows wouldn't be so terrible if you could turn things off. As it stands, I just feel a lot more comfortable using apple or linux or any unix based system basically.
https://support.apple.com/guide/mac-help/what-is-power-nap-m...
Although I don't think Apple recommends not keeping your laptop in a bag.