Answer: "Let Go" by Dave Lichens
In Science Class, Olivia recites, "Wake Up, I've been waiting for you." Later on in the movie she recites more of the lyrics to Sebastian, which go: "Wake Up, I've been waiting for you to open your eyes, so I can tell you that I think I'm ready, ready to freefall into the unknown."
The real song, "Let Go" is heard during the double date scene at Cesario's restaurant. Listen for it!