The curious effect that one encounters upon completing midnight codathons , cramming for finals, and other university all nighters. Characterized by the sudden realization that more time has passed than one has expected. Among the most common phrases uttered by the affilcted persons are, "Tomorrow already?", "I must have worked right through it", and "I can't remember when I slept last."

TTTSD can cause munchies, hallucinations, and jellohead.

Also the title of a Man... or Astroman? tune.