Thirsty nap

I was napping last Sat and I woke up halfway due to the warm weather. I saw Ryan lying beside me with eyes wide open.

Me: The weather is so warm!
Ryan: (kept quiet and staring at the ceiling)
Me: What are you doing?
Ryan: I am trying to sleep but I am so thirsty.
Me: Go and drink water lah!??
Ryan: I don't want!
Me: Why?
Ryan: Mommy is outside.
Me: So??
Ryan: She thinks I am sleeping. If she see me, I have to do homework!
Me: (Speechless)