Don't you hate it...

When in the back of your mind you know you're supposed to do something, but can't remember what it is? And then it finally comes to you but then it's too late?
Yesterday I was supposed to take an online Econ quiz by 11:45pm. I rememberd at 12:06 :( Normally the quizzes are only worth somewhere between 7 and 15 points. This one was 20. I officially went from having an A on these quizzes to an F. Just from missing one.
Sooo frustrating!