Nearly half of S. Korea's high school students say they sleep less than 6 hours a night as studying, private tutoring and late-night assignments. Half of S. Korea’s high school students sleep under 6 hours a night
9 months ago
99
Nearly half of S. Korea's high school students say they sleep less than 6 hours a night as studying, private tutoring and late-night assignments. 
English (US) ·