Syndrome where an individual believes to be the fictional character "Harry Potter" from the successful series by J.K.Rowling. Symptoms are: hallucinations of "dementors", "wizards", and other magical beings, believing that one can fly on a broomstick, waving around a stick seeing if it will make something move, disappear, or change at all, drawing a lightning bolt somewhere on the forehead, etc.

The feeling you get after experiencing an amazing year, month or any extensive time period, and then following that with a horrendously average time period.

The state of mind where you hate your immediately family who treat you badly yet you have no way of leaving them for you have no one to else to live with because you're a minor.

Harry Potter Syndrome (or HPS) is the phenononom when you begin to read a book (usually Harry Potter but also another interesting novel) around 11 pm. After reading a satisfying amount, you decide to go to bed. You look at your clock and realize it is now about 4 am.