I like that you're procrastinating your work by blogging at night!
It's important to remember to take time for yourself and yes, our work does have an impact on people (even though sometimes it isn't as obvious) but more importantly, look not to the extrinsic motivators but your intrinsic motivators - learning more about consulting, becoming better and better at your project, etc.
You're totally right - intrinsic motivators are the real drivers behind why I am doing what I do. And no - I would never call this procrastinating. There will always be work to do at the firm and it's bizarre, but somehow it is always where I left off with it ;)