Overworked (adj.):

1. to have been made to work too hard, too much, or too long; weary or exhausted with work.
2. worked beyond one's strength or capacity.

Ex. a. On average, 22 hours of work, 15 hours of school, theoretically 45 hours of study, and 8-12 hours of guard per week.
b. 3 exams within a 19-hour timeframe.

*HEAD --> DESK*