My guy seems fine with a flexible sleeping schedule, but never a long period straight through. He sleeps right next to me, so he follows my sleep patterns, which are ridiculous. And I don’t cover.
4 hours here, 3 hours there, etc., because I’m retired, we’ve gone through a year of Covid craziness, my wife works overnights, so our part of the world is pretty upside-down these days.
I’ve spoken to a few other Amazon owners in a similar situation and they say no problems, they can adapt and get into their deep sleep mode very quickly.