I'm in the same situation. Instead of sitting at the computer and not doing any work, it is better to take some time off and relax, then come back to it in a couple of days when you feel refreshed. Don't wind yourself up about it, after a few days rest, it makes me feel like i want to work, not that i have no choice. Otherwise keep setting up goals -like I need to finish this piece of work by 5pm as I am going out this evening :-) hope this helps