A friend had sent me an article not too long ago that showed how creative people spent their day. The article is fascinating. It is even more interesting to notice how many writers took walks during the day and usually only wrote for a few hours. It was said that no good writer should be done writing at the end of the day. Leave yourself wanting to write more tomorrow.
I read another article that gave the methods famous writers utilized, such as taking the door knob off of their office door so no one would bother them. I will see if I can find that one again.