Death School

I don´t know what was happening at the time of my death. Whenever I think about it, I just see a mysterious figure. I´m Catherine, by the way. I have black hair as dark as night. Just so you know, dying is not all that bad. At least you´ll get away from the worries you had when you were alive!
When I was on the ground, lifeless, with blood all around me, hours, even days could have passed. But, in this world, I am alive. But things are different. I don´t eat.
Or breathe. But I do grow. Older and taller.
I sleep at day and I´m awake at night. We do have to go to school here as well.