Questions before bedtime (insight into an inquisitive mind)

I let Christian fall asleep on my bed last night, thinking I won't have many more nights where I can devote my attention solely on him..He asked so many questions that seemed ludicrous from an adult's mind, but revealed that norms and conventions are being challenged by his young mind before being accepted.

C (Pointing to the doors in our room): "Why are there only two doors, mama? Why are there no doors there (points to wall next to window) and there (another side of the room)."

Me (blinking and trying to take his qns seriously): Because this room only requires two doors - one to the toilet and one out to the other room. We don't need a door there because we don't need to walk out into the air.

C: Who made the two doors? Is it the gardener?

Me: No, the builder. The gardener only tends to the garden..

C: Is it the construction?

Me: Yes, the construction worker, also known as the builder, built this house.

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*moments later after some goofing around*

C: I want to turn your forehead.

Me: Hmm?? What do you mean? Oh. My face is not a jigsaw puzzle, you can't turn the forehead around.

C: Why not? Why is your mouth here?

Me: God made it this way.

C: Why did God make it like that?

Me (trying hard not to grin and be serious): Erm.. If our mouths were above our eyes, we wouldn't be able to see our food, and we'd drop food into our eyes.

C: Oh. If we have our mouths on top, here (points to brow) then we have no eye brow right? Only naughty korkor has his mouth on top.

C: Why your eye not big? Why I cannot open your eye and make it bigger?

Me: Because God made my eye this big.
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C (clutches my head with both his hands, and laughs as he bangs his forehead against mine. Suddenly struck him to ask..): Why is your head bigger than mine? Why did God make mama and daddy big, and Christian and meimei little?

Me: Eh.. mama and daddy used to be small too and Gonggong and Popo were big, then mama and daddy grew bigger.. and I gave birth to Christian..remember the pictures you saw of mama when I was little?

C: Yes. When you were small, you went to school right? You went to my school?

Me (Decides to put an end to the qns, else sleep would be an unachievable goal): No I went to my own school. And are you going to close your eyes and sleep? If not, you'll have to go back into your own bed.

C promptly clenches his eyes shut, turns to face me, and falls asleep while grabbing my wrist to make sure I don't run away and leave him alone.