Do you ever have those days

...where you just stare at the page (or screen), and nothing comes?  Today has been one of those days for me, and I'm not even talking about my novel.  I'm talking about before I even got to my novel, when I was still blogging.  I worked on a book review blog post and a post on my horse blog, and in both cases, I stared at the screen for a good long time before I decided what I wanted to write about.

This is an unusual occurrence, especially for my horse blog.  I always know what I want to write about on my horse blog.

As a result, I haven't gotten around to doing what I wanted to do on my novel today.  So frustrating.

Does this ever happen to you?  How do you deal with it?