What do you do afterwards?

Here is a topic that has always interested me. We all have those very important moments in our lives, when we have an important interview, a deciseve exam, a first date, etc. What do we do after it is over?
It has always been difficult to me to decide what one has to do afterwards. Do you get yourself slammed in a bar, do you spend the whole afternoon watching movies, do you go out for a walk, or do you sit doewn and do even more work?!
Not so long ago, when I was taking SAT exams, I usually could not sleep the night before. After the exam was over, I usually felt like doing a whole lot of things. I felt like I had all the time that I needed to do everything. Believe it or not, what I have wanted to do the most is go do a lot of work! I did not feel tired, I felt like I was on a winning spree! I needed to go on!
Now, I feel in a similar position when I go out of the last exam for the semester, or the last exam before the spring break. I am overwhelmed by the thought that I have unlimited amount of time and I want to go on accomplidhing even more!
Usually the problem is that I am dead tired, and I need to get some sleep. And after I do it, most of the feeling that I had after the exam is gone. I can slack for several hours and then go back to work, but the unique emotion of after the exam is long gone! What can I do to keep it? Is there a formula? Has anyone else felt like that?
I think that this feeling is the feeling of a the turning point. You close on e page and start writing the next. And how excited you are when the page in front of you is blank and brand new! You can do anything with it! You can write whatever you like, and noone can stop you from doing it! Well, not exactly :( This is just the initial euphoria. Then the mind gets used to the the current position and gets back into the comfortable line of "I am used to it." And then - goodbye enthusiasm, goodbye euphoria, hello routine!
How do you keep the emotion?