I see…
I have tried a few things following suggestions here- (Nicla Vision - deep sleep after accessing camera sensor - Arduino Boards - OpenMV Forums) but nothing really significantly reduces the draw in Portenta. I maybe now understand why.
My system basically sits idle until motion is detected (PIR sensor), and ExtInt() + machine.lightsleep() seems like a good option for a quick recovery to power.
I wanted to try sensor.sleep() and see if I can further improve, but am getting OSError: Sleep Failed
PC