No kid or adult sleeps more than 4 hours before alerting.
Adults roll over & re-sleep, usually forgetting they did. Kids will often get up and engage you in play if you let them. It is private, one on one time. I would establish a plan. Let them play if they wish, do not join them. If they stay in the room their door remains open but you close it if they cruse the house (safety). Works for many