"Biology’s cruel joke goes something like this: As a teenage body goes through puberty, its circadian rhythm essentially shifts three hours backward. Suddenly, going to bed at nine or ten o’clock at night isn’t just a drag, but close to a biological impossibility. Studies of teenagers around the globe have found that adolescent brains do not start releasing melatonin until around eleven o’clock at night and keep pumping out the hormone well past sunrise. Adults, meanwhile, have little-to-no melatonin in their bodies when they wake up. With all that melatonin surging through their bloodstream, teenagers who are forced to be awake before eight in the morning are often barely alert and want nothing more than to give in to their body’s demands and fall back asleep. Because of the shift in their circadian rhythm, asking a teenager to perform well in a classroom during the early morning is like asking them to fly across the country and instantly adjust to the new time zone — and then do the same thing every night, for four years."
“She’s his confidante. She’s the only one who knows that he’s Spider-Man, which is kinda great. And the nice thing is that Gwen falls in love with Peter first. She loves the boy, in spite of him being Spider-Man, rather than the other way around.” - Emma Stone
Cutting off hair in ancient Asia (China, Japan, Korea, Thailand, Vietnam, etc.) symbolises being banished. In the more modern age, that is now, cutting long hair into a short cut means to forget the past, leaving the old and starting anew.