yes thanks and to everyone that sighed that I was repeating a question, I'm sorry. Have found the twenty pages of dialogue the last question created and I am now 'with knowledge'.
And can also gloat to everyone I've had the convo with that I was right, la dee daaa
But overtired doesn't fit into the script of the advert. When a child is losing his/her temper the common reaction by parent would be to comment on the fact that they must be getting tired. The Vauxhall ad reverses the roles so Oh they're tired must be the real words spoken. It doesn't make sense that when the parents argue the child would say that they are overtired. What does overtired mean anyway? You can be tired but at what point do you become overtired?