What just happened?

I believe that reflection is integral to successful teaching.  One of my pet peeves is when I have to teach a class at the end of the work day.  Why? I hate it when I'm scrambling to pack up my things for fear the security guards will be smiling on the outside but glaring at me on the inside because they simply want to lock up and leave. The few minutes after my lesson are an important time for me to think about what went well, what didn't and why.  I am also likely think about it later that night or the next morning. (To date I haven't let my work invade my dreams).

What does research say about written reflection?

Dear Diary, Guess what happened at work today?!