what was up with this?

Rating: Null/10 (4 August 2006)

toward the beginning, when sarah is in the hospital... she wakes up and begins sprinting down the corridor, as the hallway lights begin turning off. as it obviously shows, that didn't actually happen, and she begins hugging her friend. she also has visions of her daughter blowing out candles of a birthday cake, and in the cave, hears the laughing and voice of a little girl... my simple question is: whats going on here??? is she going crazy and merely imagining everything? or is it a some kind of symbolic mumbo-jumbo? even perhaps something completely different from the before mentioned??

thanks