Children and late nights

So what is the rule? Anna says if child stays up late, then cranky in the morning. But child have great fun stay up late. Last night Arden and Maile and I played pirate ship until about 9:30pm at our neighbors. Today, I mowed the lawn until 9:30pm and Arden was wide awake so he and I watered the garden, then loaded the car with recyclables, then delivered them, then played computer games. It was a great daddy son time. All people should do that.