Because you might wake up and have no water in the apartment!
I woke up and there was water to make the coffee. Then I did a little work in my bathrobe, until it was time to wake up Stick to take his shower. There was water then, the bathroom tile is still wet from Stick’s shower, but now nothing’s coming out of any of the faucets! Not the shower, the bathroom sink or the kitchen tap either. Which means no second cup of coffee, but that’s probably ok since I can’t brush my teeth, either!
I knew I shouldn’t have been nice to Stick! Why did I let him shower first?