When being lazy, be as best as you can at that; lazy! Relax!
However, as David Allen (author of Getting Things Done) says: you can only be really relaxed when you are sure that the things you are not thinking about, are things you don't need to be thinking about...*
That sounds complex:
Make sure that you have all the things that are on you mind on a place you trust you'll pick it up later again (agenda, task manager, inbox). Why? So you don't have to think about the things on that list, and fully can relax! Think of new things, just add it to that list.
On getting away from laziness there are a couple of things you could consider doing / thinking about.
cleaning; go and start your day cleaning old stuff away, just take 15 to 30 minutes (not more!), you'll feel invigorated to do more, use that renewed energy to do something else than cleaning.
just starting; sometimes it helps to delude yourself in thinking you will only work a little bit on something. Writing 15 minutes on your great unstarted novel is more then nothing. Better yet, you increase the chance you get into a flow, and work for an hour or a day on that task, and feel you didn't work at all! Also in this technique you don't feel any guilt if you 'just' did 15 minutes, because that was your target after all!
Both have to do with this method:
- chunking; have really big complex projects that dawn onto you? consider chop them into bite-size tasks! Make a project outline, always keep two things in mind: What does finishing that project look like? That is your goal. And what is the next physical action to going towards that goal.
More you can read up on this in David Allen his excellent books; Getting Things Done, and Making it All Work. Also available as audiobooks. I myself got started on the GTD-bandwagon via Getting-Things-Done-Fast, an unauthorized audio seminar of David Allen before he wrote the book.
Good luck being as lazy as you can be!
*I'm probably paraphrasing that sentence, but it sounds like what I heard him saying once in an interview.