Should be a sleep

So it's 1:40 am, and I was having that moment that everyone has whereby every bad mistake or embarrassment passes through the brain. Why can't that part of my brain that stores memories just think 'hey you know what, maybe we should store some of that stuff, you know the stuff needed for exams and such'. But nope I seem to be in a perpetual state of remembrance in the most inconvient moment such as: when I'm trying to fall asleep.