You did this once every six months, and every time you did you promised yourself it would never happen again. Six months passed and it was back to learning the same old lessons. Don't worry: this lesson continues through college, graduate school, and your professional life. For some reason, mankind can get to space and create deeply moving works of art, but we can't find a way to remind ourselves to save our work at appropriate intervals. We've all pulled our share of all-nighters growing up, but nothing was ever as bad as when the night was spent recreating work you already completed.