For Berkeley students, its pretty typical to take a gap year before plunging into a health professional school. I think its becoming more and more common, as people begin to realize the amount of debt they will be in as soon as they finish med/dental/opto/whatever school, and see that there's significantly less room for simply enjoying life. Plus, Berkeley kids are usually burned out from 4 years (or more) or camping out at the library, being constantly caffeinated, and just getting too little sleep.
So why take a gap year? Here were my reasons:
Sleep, play, and learn.