A few months ago at about 3:30 AM, Simon woke me by shouting from his bed.
"Moooooommy! Daaaaaddy!"
I went to his room. Maybe he'd had a nightmare?
David: What's wrong, Simon? Are you okay?
Simon: I'm thirsty!
David: [Rubbing eyes and taking a deep breath] Okay. I'll get you a drink of water.
After his refreshing beverage, I tried to explain that being thirsty was not a good enough reason to awaken the rest of his family and told him that he could keep some water on his bedside table in the future if he liked.
Shortly after bedtime the next night, Simon started up again with the yelling, "Daaaaaaddy!"
David: What's wrong, Simon?
Simon: Blue and Magenta are downstairs!
I thought for a moment about the magnitude of this crisis...then sat down next to him on his bed.
David: Simon, are you bleeding?
Simon: [checks]...no.
David: Is anything on fire?
Simon: [Looks around his room]...no.
David: Okay, so here's what to remember. If you're bleeding or on fire, those are really good reasons to wake everyone else by shouting. If you have a problem that's a lot smaller than one of those, it can probably wait until morning and it is not appropriate to wake everyone else by shouting. Got it?
Simon: Yes.
David: You're sure?
Simon: Yes.
David: Let's find out. What are two good reasons to wake everyone else by shouting late at night?
Simon: Bleeding or fire!
David: Awesome. G'night, Simon- sleep well.
Simon: Sleep well, daddy!
And I did. He hasn't done it again since.