Yep, that's exactly what I feel like at the moment. I've been going through a slump where all I want to do is either stay in bed, wrapped in the warm blankets (hey it's Winter here) or just procrastinate which means hours on end playing Facebook games... I can actually waste most of the day with those pointless games.
I can force myself to sit in front of the computer and just stare at the blank page, but that's not going to get my WiP written. One thing I have found that has helped get me out of this motivation slump is throwing myself into an editing course to give me something productive to do. I'm going to go back to my WiP once I'm sure I can productively add to the story.
Have you ever gone through a motivation slump? How did you get out of it?