American high school students sleep only 4 hours a day and drink 4 cans of coffee

Edward humes, american journalist, won the pulitzer prize, the highest journalism prize. He spent the school year squatting at a public high school. A year of experience led him to write a book called The School of Dreams, the first chapter of which had the long title: 4 is the magic number: 4 hours of sleep, 4 lattes, 4.0. This book describes the students of this high school: