I work from home so I have to put in extra effort to get myself going on many mornings. I make sure I go through the same morning ritual as I would if I were to go to a real office. Take a shower, get dressed and eat breakfast before even thinking about reading email. By that time I should be good to go. If you still can't get going then starting off on something you really want to do than something that is just work is a good way to get going too.