Your boss makes you stay late. Your supper was a half-cooked hamburger and cold fries from a local fast food restaurant. Your dog wants to go out. And all you want to do is crawl in bed and forget the entire day. As much as we try to carry a stiff upper lip, we're still human.
External factors can affect our mood and ultimately affect our writing.
Our focus shifts to all the bad things that happened in our day and writing becomes the last thing we want to do. Writing every day is essential to keeping those creative juices flowing. You don't have to make an impossible deal with yourself to write 100 pages of your manuscript in one sitting. Taking as little as 10 minutes a day helps keep you writing and words will flow from your mind much easier. The perfect paragraph, word after word, is a carefully constructed piece of art.