College dorm rooms bring on their own breed of sleep saboteurs -- from the always-looming coursework to the impromptu Justin Bieber dance party happening down the hall. But anyone who has pulled or attempted an all-nighter has felt the dismal effects of getting too little sleep. Sleep debt (i.e., not getting enough of it) has short- and long-term consequences for your body, your health and how you function, says Jess Shatkin, professor of child and adolescent psychiatry at the New York University School of Medicine.