Yes, at around two years old toddlers start to get a better awareness of things around them. She may have a very real fear of the dark that has developed, or perhaps a fear of being left alone. A very small night light might help to assuage her fears (they make some really neat ones now), and also the knowledge that you are nearby. When my son was first sleeping in his own bed, we counted the steps between our rooms, as a way to make him feel better ("only ten steps to Mommy and Daddy's room!"). As she gets older, she will change her fears and worries according to her new and heightened awareness of things, and also your perceptions that she picks up on. Also, just as a side note, her sleep needs will probably change around now, she might not want to nap anymore, and getting up earlier is par for the course-she doesn;t want to miss a single thing! Good luck.