Why do your eyes pop open at the first sign of daylight?

Miss Sofia May,
I know you're little, but you really DO have to do what I say. And I say GO BACK TO SLEEP! Your sister is still asleep. And so is the cat. And I would be too if not for your eyes popping open just because a little ray of light came through the window. I'm sure it would be futile to explain, but it IS summer. In the summer, the sun comes up sooner and stays up later. This does not effect bedtime.. and your protests don't help your cause. I will win this battle!