Ключевые слова: ache, african, american, balance, black, book, bored, boring, burn, coach, college, computer, depressed, desk, eye, face, fail, fatigue, for, frustrated, girl, glasses, head, laptop, lazy, life, management, math, mathematics, narcolepsy, number, pain, problem, school, sleep, sleeping, sleepy, smart, stress, student, teach, teacher, teaching, teen, time, tired, tutor, university, woman, women,