I wonder if the big difference is the amount of crap constantly taking up our attention. Apes don't have to worry about waking up at a precise time, picking up

I wonder if the big difference is the amount of crap constantly taking up our attention. Apes don't have to worry about waking up at a precise time, picking up groceries, the softball game on Friday, etc. etc. Physical exhaustion seems to draw on the same pool of energy that we use to ruminate and stress about all of this crap, so maybe that's part of the reason it helps.