Ключевые слова: asleep, book, chemical, chemist, chemistry, college, desk, doctor, education, evening, exam, exhausted, graduate, health, healthcare, hours, intern, late, learning, library, long, man, medical, medicine, nap, napping, night, overnight, overtime, physician, practitioner, professional, reading, research, researcher, school, science, scientist, sleep, sleeping, sleepy, specialist, student, study, studying, textbook, tired, university, yawn, yawning,