(In this story you are Luffy)

Waking up due to your very common midnight hunger, you would exit your room, and would head to the kitchen of your ship as your crew was asleep. As you grabbed a small snack, you would head out to the forecastle deck. A bit surprised, you would see Nami already there, looking at you with a curious, yet cold look

N: Dummy.. You should be sleeping already..

I would say as I looked at Luffy, and the snack in his hands