To have commitments the next day, esp. in the morning, eg interviews, work, dates etc, that prevents you from doing something (usually fun and stupid) on that night.
Originated, (obviously) when having to go to bed early because school was the next day.
- I'd love to get drunk and stay out all night with you guys, but it's a school night!
skyrim- игра Скайрим
legendary [ˈleʤəndərɪ] легендарный уровень сложности
auto save - авто сохранение
mage [meɪʤ] маг
promote [prəˈməʊt] продвигать по службе
executive [ɪgˈzekjʊtɪv] управляющий