Night vision

I was on the phone with my mum tonight. I talked a bit long when I was actually supposed to be reading Ella bedtime stories. Suddenly she switched off the light and continued jumping on the bed while I sat there in the dark talking into the phone. I finally interrupted my phone conversation and asked:

Me - Ella, why did you switch of the light?
Ella - Because I ate carrots and I want to see if they help me see in the dark.

That made total sense to me too.