There's a fine line between working on your writing every day and grinding it into the ground. That's why EVERY writing teacher (worth listening to) always recommends letting your work sit and simmer for a few days after you complete a draft.
"But Giles," you say, "my book is 100k words long. By the time I get to the end of the last chapter, the beginning has stewed enough for me to look at it with fresh eyes!"
Well, you're wrong. Not because you're wrong, but just because you are. Whether or not that's ACTUALLY true, you NEED to take a breather! Even if it's just a day. Why? Because if you don't, you'll start having imaginary conversations with random people who may or may not read your blog.
Take some time to rest. Don't STOP writing. Go free-write. Read a book ABOUT writing. Research your next project. Create a character. Write a short story. But step away from the current project (unless you have a deadline looming!).
NOW the question is, what should you do with your free time? How should you relax? Since I just started it, and I found out how fun it is, I recommend home-brewing. But if that's not your thing, there are board games, card games, RPGs, video-games... wait, you don't do that either? How about knitting? Bike-riding, jogging, (exercise is VERY good for you, and it stimulates your brain!). Learn a new language. Take up painting (my condo is in need of a few coats... or a nice Monet).
The point is, if you work to hard, you'll turn out crappy writing, and you'll burn out. It's a double-whammy of MAJOR reasons why you should find a hobby.
See you Monday!