A temporary disruption of the body's normal biological rhythms after being on break from school. Similar to jetlag but is caused by going back to school after being on break rather than by time zones. A person experiencing breaklag will find that they cannot sleep until very late and cannot wake up on time for classes upon returning to college.
Mina: "...also, why are you still awake?"
Christina: "I either don't sleep or I go to bed past 6am."
Mina: "Breaklag much?"