My mother always fell asleep after lunch, so we had nap time as a matter of course until we were teenagers. Or sneak-off-and-read time. It was always my favorite time of day. I always just shut the door to the room (D1 takes hers in our room so as not to disturb D2) and ignore everything but loud crashes for two hours. So far they still both sleep most days, I suspect. But whatever it takes to keep Mom sane, I say.