Ключевые слова: business, businessman, businessperson, businesswoman, company, concentration, dark, deadline, desk, determination, document, effort, employee, entrepreneur, executive, exhausted, fail, finance, focused, frustration, hours, indoor, manager, meeting, night, occupation, office, office syndrome, overtime, overwork, overworked, planning, problem, productivity, profession, rest, serious, sleep, sleepy, startup, stress, struggle, syndrome, teamwork, technology, tired, trouble, work, working, worried,