3:59 by Gretchen McNeilRead about the other entries on the list.
Josie Byrne and her scientific dreaming leads to a double life. For Josie, teenage life is pretty tough so far. Her parents are divorcing, she’s struggling in physics at school and she feels like she is becoming detached from her boyfriend. However, when she gets some shut eye at night, she dreams of a polar life. One exactly like her own but better and… she dreams about Jo. Josie and Jo realise that they are doppelgängers living in parallel universes that overlap every twelve hours at exactly 3:59. Josie is intrigued by this other life but there’s a chance she’ll be trapped there when the portal seals. Thank goodness she’s got a sharp, analytical brain because that is certainly needed in order for her to make a home run. Perhaps her next physics lesson won’t be so tough after all!